## NCERT Solutions Class 8 Maths Chapter 8 â€“ Free PDF Download

**NCERT Solutions for Class 8 Maths Chapter 8 **Comparing Quantities are developed by subject experts, ensuring the requirements of a CBSE Class 8 student. These NCERT Solutions for Class 8 are to the point and do not confuse students; they instead help them in reaching a conclusion using the ideal problem-solving method. Solving the NCERT textbookâ€™s exercise questions will offer the students the advantage of preparing themselves adequately, well ahead of the final CBSE exams.

BYJUâ€™S **NCERT Solutions for Class 8 Maths** aims to bring out the best in students by further skill-building exercises that are apt to their class, strengths and interests. Referring to these solutions will boost confidence among students for taking up CBSE Class 8 Maths exams. The Grade 8Â NCERT SolutionsÂ are an invaluable aid to students for their exam preparations.

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**Exercise 8.1 Page No: 119**

**1. Find the ratio of the following:**

**(a) Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.**

**(b) 5 m to 10 km**

**(c) 50 paise to â‚¹ 5**

**Solution:**

a) Ratio of the speed of cycle to the speed of scooter = 15/30 = Â½ = 1:2

b) Since, 1 km = 1000m

5m/10km = 5m/(10 x 1000)m = 5/10000 = 1/2000 = 1:2000

The required ratio is 1: 2000

c) Since, â‚¹1 = 100 paise

50 paise/â‚¹5 = 50/(5 x 100) = 50/500 = 1/10 = 1:10

The required ratio is 1: 10

**2. Convert the following ratio to percentages **

**a) 3:4**

**b) 2:3**

**Solution:**

a) 3:4 = Â¾ = Â¾ x 100% = 0.75 x 100% = 75%

b) 2:3 = 2/3 = 2/3 x 100% = 0.666 x 100% = 66.66% = 66â…”%

**3. 72% of 25 students are good in mathematics. How many are not good in mathematics?**

**Solution:**

Itâ€™s given that 72% of 25 students are good in mathematics

So, the percentage of students who are not good in mathematics = (100 â€“ 72)%

= 28%

Here, number of students who are good in mathematics = 72/100 x 25 = 18

Thus, the number of students who are not good in mathematics = 25 â€“ 18

= 7

[Also, 28% of 25 = 28/100 x 25 = 7]Therefore, 7 students are not good in mathematics.

**4. A football team won 10 matches out of the total number of matches they played. If their win percentage was 40, then how many matches did they play in all?**

**Solution:**

Let the total number of matches played by the team be x.

Given that the team won 10 matches and the winning percentage of the team was 40%.

â‡’ 40/100 Ã— x = 10

40x = 10 Ã— 100

40x = 1000

x = 1000/40

= 100/4

= 25

Therefore, the team played 25 matches.

**5. If Chameli had â‚¹600 left after spending 75% of her money, how much did she have in the beginning?**

**Solution:**

Let the amount of money which Chameli had in the beginning be x

Given that, after spending 75% of â‚¹x, she was left with â‚¹600

So, (100 â€“ 75)% of x = â‚¹600

Or, 25% of x = â‚¹600

25/100 Ã— x = â‚¹600

x = â‚¹600 Ã— 4

= â‚¹2400

Therefore, Chameli had â‚¹2400 is the beginning.

**6. If 60% people in city like cricket, 30% like football and the remaining like other games, then what per cent of the people like other games? If the total number of people are 50 lakh, find the exact number who like each type of game.**

**Solution:**

Percentage of people who like other games = (100 â€“ 60 â€“ 30)%

= (100 â€“ 90)%

= 10%

Total number of people = 50 lakhs

So,

Number of people who like cricket = 60/100 x 50 = 30 lakhs

Number of people who like football = 30/100 x 50 = 15 lakhs

Number of people who like other games = 10/100 x 50 = 5 lakhs

**Exercise 8.2 Page No: 125**

**1. A man got a 10% increase in his salary. If his new salary is â‚¹1,54,000, find his original salary.**

**Solution:**

Let the original salary be x

Given that, the new salary is â‚¹1,54,000

Original salary + Increment = New salary

Given that the increment is 10% of the original salary

So, (x + 10/100 Ã— x) = 154000

x + x/10 = 154000

11x/10 = 154000

x = 154000 Ã— 10/11

= 140000

Therefore, the original salary was â‚¹1,40,000.

**2. On Sunday 845 people went to the Zoo. On Monday only 169 people went. What is the per cent decrease in the people visiting the zoo on Monday?**

**Solution:**

Given that on Sunday, 845 people went to the zoo and on Monday, 169 people went to the zoo

Decrease in the number of people = 845 â€“ 169 = 676

Thus,

Percentage decrease = (Decrease in the number of people/Number of people who went to zoo on Sunday) x 100%

= (676/845 x 100)%

= 80%

**3. A shopkeeper buys 80 articles for â‚¹ 2,400 and sells them for a profit of 16%. Find the selling price of one article.**

**Solution:**

Given that the shopkeeper buys 80 articles for â‚¹ 2,400

Cost of one article = 2400/80 = â‚¹ 30

Profit percentage = 16%

Profit percentage = Profit/C.P x 100

16 = Profit/30 x 100

Profit = (16 x 30)/100

= â‚¹ 4.8

Therefore, selling price of one article = C.P + Profit

= â‚¹ (30 + 4.80)

= â‚¹ 34.80

**4. The cost of an article was â‚¹ 15,500. â‚¹ 450 were spent on its repairs. If it is sold for a profit of 15%, find the selling price of the article.**

**Solution:**

Total cost of an article = Cost + Overhead expenses

= â‚¹15500 + â‚¹450

= â‚¹15950

Profit percentage = 15%

Profit percentage = Profit/C.P x 100

15 = Profit/15950 x 100

Profit = (15 x 15950)/100

= 2392.50

Therefore, Selling price of the article = C.P + Profit

= â‚¹(15950 + 2392.50)

= â‚¹18342.50

**5. A VCR and TV were bought for â‚¹ 8,000 each. The shopkeeper made a loss of 4% on the VCR and a profit of 8% on the TV. Find the gain or loss percent on the whole transaction.**

**Solution:**

C.P. of a VCR = â‚¹ 8000

The shopkeeper made a loss of 4 % on VCR

This means if C.P. is â‚¹ 100, then S.P. is â‚¹ 96. When C.P. is â‚¹ 8000

S.P. = (96/100 x 8000) = â‚¹ 7680

C.P. of a TV = â‚¹ 8000

The shopkeeper made a profit of 8 % on TV.

This means that if C.P. is â‚¹ 100, then S.P. is â‚¹ 108.

When C.P. is â‚¹ 8000,

S.P. = (108/100 x 8000) = â‚¹ 8640

Total S.P. = â‚¹ 7680 + â‚¹ 8640 = â‚¹ 16320

Total C.P. = â‚¹ 8000 + â‚¹ 8000 = â‚¹ 16000

Since, total S.P.> total C.P. â‡’ profit

Profit = â‚¹ 16320 âˆ’ â‚¹ 16000 = â‚¹ 320

Therefore, the shopkeeper had a gain of 2% on the whole transaction.

**6. During a sale, a shop offered a discount of 10% on the marked prices of all the items. What would a customer have to pay for a pair of jeans marked at â‚¹ 1450 and two shirts marked at â‚¹ 850 each?**

**Solution:**

Total marked price = â‚¹ (1,450 + 2 Ã— 850)

= â‚¹ (1,450 +1,700)

= â‚¹ 3,150

Given that, discount percentage = 10%

Discount = â‚¹ (10/100 x 3150) = â‚¹ 315

Also, Discount = Marked price âˆ’ Sale price

â‚¹ 315 = â‚¹ 3150 âˆ’ Sale price

âˆ´ Sale price = â‚¹ (3150 âˆ’ 315)

= â‚¹ 2835

Therefore, the customer will have to pay â‚¹ 2,835.

**7. A milkman sold two of his buffaloes for â‚¹ 20,000 each. On one he made a gain of 5% and on the other a loss of 10%. Find his overall gain or loss.**

**(Hint: Find CP of each)**

**Solution:**

S.P. of each buffalo = â‚¹ 20,000

The milkman made a gain of 5% while selling one buffalo

This means if C.P. is â‚¹ 100, then S.P. is â‚¹ 105.

C.P. of one buffalo = 100/105 Ã— 20000

= â‚¹ 19,047.62

Also, the second buffalo was sold at a loss of 10%

This means if C.P. is â‚¹ 100, then S.P. is â‚¹ 90

âˆ´ C.P. of other buffalo = 100/90 Ã— 2000

= â‚¹ 22222.22

Total C.P. = â‚¹ 19047.62 + â‚¹ 22222.22 = â‚¹ 41269.84

Total S.P. = â‚¹ 20000 + â‚¹ 20000 = â‚¹ 40000

Loss = â‚¹ 41269.84 âˆ’ â‚¹ 40000 = â‚¹ 1269.84

Therefore, the overall loss of milkman was â‚¹ 1,269.84

**8. The price of a TV is â‚¹ 13,000. The sales tax charged on it is at the rate of 12%. Find the amount that Vinod will have to pay if he buys it,**

**Solution:**

On â‚¹ 100, the tax to be paid = â‚¹ 12

Here, on â‚¹ 13000, the tax to be paid will be = 12/100 Ã— 13000

= â‚¹ 1560

Required amount = Cost + Sales Tax

= â‚¹ 13000 + â‚¹ 1560

= â‚¹ 14560

Therefore, Vinod will have to pay â‚¹ 14,560 for the T.V.

**9. Arun bought a pair of skates at a sale where the discount given was 20%. If the amount he pays is â‚¹ 1,600, find the marked price.**

**Solution:**

Let the marked price be x

Discount percent = Discount/Marked Price x 100

20 = Discount/x Ã— 100

Discount = 20/100 Ã— x

= x/5

Also,

Discount = Marked price â€“ Sale price

x/5 = x â€“ â‚¹ 1600

x â€“ x/5 = 1600

4x/5 = 1600

x = 1600 x 5/4

= 2000

Therefore, the marked price was â‚¹ 2000.

**10. I purchased a hair-dryer for â‚¹ 5,400 including 8% VAT. Find the price before VAT was added.**

**Solution:**

The price includes VAT

So, 8% VAT means that if the price without VAT is â‚¹ 100,

then price including VAT will be â‚¹ 108

When price including VAT is â‚¹ 108, original price = â‚¹ 100

When price including VAT is â‚¹ 5400, original price = â‚¹ (100/108 Ã— 5400)

= â‚¹ 5000

Therefore, the price of the hair-dryer before the addition of VAT was â‚¹ 5,000.

**Exercise 8.3 Page No: 133**

**1. Calculate the amount and compound interest on**

**(a) â‚¹ 10,800 for 3 years at 12Â½ % per annum compounded annually.**

**Solution:**

Principal (P) = â‚¹ 10,800

Rate (R) = 12Â½ % = 25/2 % (annual)

Number of years (n) = 3

Amount (A) = P(1 + R/100)^{n}

= 10800(1 + 25/200)^{3}

= 10800(225/200)^{3}

= 15377.34375

= â‚¹ 15377.34 (approximately)

C.I. = A â€“ P = â‚¹ (15377.34 â€“ 10800) = â‚¹ 4,577.34

**(b) â‚¹ 18000 for 2Â½ years at 10% per annum compounded annually.**

**Solution:**

Principal (P) = â‚¹ 18,000

Rate (R) = 10% annual

Number of years (n) = 2Â½

The amount for 2 years and 6 months can be calculated by calculating the amount for 2 years

using the compound interest formula, and then calculating the simple interest for 6 months on the amount obtained at the end of 2 years

First, the amount for 2 years has to be calculated

Amount, A = P(1 + R/100)^{n}

= 18000(1 + 1/10)^{2}

= 1800(11/10)^{2}

= â‚¹ 21780

By taking â‚¹ 21780 as principal, the S.I. for the next Â½ year will be calculated

S.I. = (21780 x Â½ x 10)/100

= â‚¹ 1089

Hence, the interest for the first 2 years = â‚¹ (21780 â€“ 18000) = â‚¹ 3780

And, interest for the next Â½ year = â‚¹ 1089

Total C.I. = â‚¹ 3780 + â‚¹ 1089

= â‚¹ 4,869

Therefore,

Amount, A = P + C.I.

= â‚¹ 18000 + â‚¹ 4869

= â‚¹ 22,869

**(c) â‚¹ 62500 for 1Â½ years at 8% per annum compounded half yearly.**

**Solution:**

Principal (P) = â‚¹ 62,500

Rate = 8% per annum or 4% per half year

Number of years = 1Â½

There will be 3 half years in 1Â½ years

Amount, A = P(1 + R/100)n

= 62500(1 + 4/100)^{3}

= 62500(104/100)^{3}

= 62500(26/25)^{3}

= â‚¹ 70304

C.I. = A â€“ P = â‚¹ 70304 â€“ â‚¹ 62500 = â‚¹ 7,804

**(d) â‚¹ 8000 for 1 year at 9% per annum compound half yearly.**

**(You could use the year by year calculation using SI formula to verify) **

**Solution:**

Principal (P) = â‚¹ 8000

Rate of interest = 9% per annum or 9/2% per half year

Number of years = 1 year

There will be 2 half years in 1 year

Amount, A = P(1 + R/100)^{n}

= 8000(1 + 9/200)^{2}

= 8000(209/200)^{2}

= 8736.20

C.I. = A â€“ P = â‚¹ 8736.20 â€“ â‚¹ 8000 = â‚¹ 736.20

**(e) â‚¹ 10000 for 1 year at 8% per annum compounded half yearly.**

**Solution:**

Principal (P) = â‚¹ 10,000

Rate = 8% per annum or 4% per half year

Number of years = 1 year

There are 2 half years in 1 year

Amount, A = P(1 + R/100)n

= 10000(1 + 4/100)2

= 10000(1 + 1/25)2

= 10000(26/25)2

= â‚¹ 10816

C.I. = A â€“ P = â‚¹ 10816 â€“ â‚¹ 10000 = â‚¹ 816

**2. Kamala borrowed â‚¹ 26400 from a Bank to buy a scooter at a rate of 15% p.a. compounded yearly. What amount will she pay at the end of 2 years and 4 months to clear the loan?**

**(Hint: Find A for 2 years with interest is compounded yearly and then find S.I. on the 2nd year amount for 4/12 years.)**

**Solution:**

Principal (P) = â‚¹ 26,400

Rate (R) = 15% per annum

Number of years (n) = 2 4/12

The amount for 2 years and 4 months can be calculated by first calculating the amount for 2

years using the compound interest formula, and then calculating the simple interest for 4 months on the amount obtained at the end of 2 years

First, the amount for 2 years has to be calculated

Amount, A = P(1 + R/100)^{n}

= 26400(1 + 15/100)^{2}

= 26400(1 + 3/20)^{2}

= 26400(23/20)^{2}

= â‚¹ 34914

By taking â‚¹ 34,914 as principal, the S.I. for the next 1/3 years will be calculated

S.I. = (34914 Ã— 1/3 x 15)/100 = â‚¹ 1745.70

Interest for the first two years = â‚¹ (34914 â€“ 26400) = â‚¹ 8,514

And interest for the next 1/3 year = â‚¹ 1,745.70

Total C.I. = â‚¹ (8514 + â‚¹ 1745.70) = â‚¹ 10,259.70

Amount = P + C.I. = â‚¹ 26400 + â‚¹ 10259.70 = â‚¹ 36,659.70

**3. Fabina borrows â‚¹ 12,500 at 12% per annum for 3 years at simple interest and Radha borrows the same amount for the same time period at 10% per annum, compounded annually. Who pays more interest and by how much?**

**Solution:**

Interest paid by Fabina = (P x R x T)/100

= (12500 x 12 x 3)/100

= 4500

Amount paid by Radha at the end of 3 years = A = P(1 + R/100)^{n}

A = 12500(1 + 10/100)^{3}

= 12500(110/100)^{3}

= â‚¹ 16637.50

C.I. = A â€“ P = â‚¹ 16637.50 â€“ â‚¹ 12500 = â‚¹ 4,137.50

The interest paid by Fabina is â‚¹ 4,500 and by Radha is â‚¹ 4,137.50

Thus, Fabina pays more interest

â‚¹ 4500 âˆ’ â‚¹ 4137.50 = â‚¹ 362.50

Hence, Fabina will have to pay â‚¹ 362.50 more.

**4. I borrowed â‚¹ 12000 from Jamshed at 6% per annum simple interest for 2 years. Had I borrowed this sum at 6% per annum compound interest, what extra amount would I have to pay?**

**Solution:**

P = â‚¹ 12000

R = 6% per annum

T = 2 years

S.I. = (P x R x T)/100

= (12000 x 6 x 2)/100

= â‚¹ 1440

To find the compound interest, the amount (A) has to be calculated

Amount, A = P(1 + R/100)^{n}

= 12000(1 + 6/100)^{2}

= 12000(106/100)^{2}

= 12000(53/50)^{2}

= â‚¹ 13483.20

âˆ´ C.I. = A âˆ’ P

= â‚¹ 13483.20 âˆ’ â‚¹ 12000

= â‚¹ 1,483.20

C.I. âˆ’ S.I. = â‚¹ 1,483.20 âˆ’ â‚¹ 1,440

= â‚¹ 43.20

Therefore, the extra amount to be paid is â‚¹ 43.20.

**5. Vasudevan invested â‚¹ 60000 at an interest rate of 12% per annum compounded half yearly. What amount would he get**

**(i) after 6 months?**

**(ii) after 1**

**Solution:**

(i) P = â‚¹ 60,000

Rate = 12% per annum = 6% per half year

n = 6 months = 1 half year

Amount, A = P(1 + R/100)^{n}

= 60000(1 + 6/100)^{1}

= 60000(106/100)

= 60000(53/50)

= â‚¹ 63600

(ii) There are 2 half years in 1 year

So, n = 2

Amount, A = P(1 + R/100)^{n}

= 60000(1 + 6/100)^{2}

= 60000(106/100)^{2}

= 60000(53/50)^{2}

= â‚¹ 67416

**6. Arif took a loan of â‚¹ 80,000 from a bank. If the rate of interest is 10% per annum, find the difference in amounts he would be paying after 1Â½ years if the interest is **

**(i) Compounded annually**

**(ii) Compounded half yearly**

**Solution:**

(i) P = â‚¹ 80,000

R = 10% per annum

n = 1Â½ years

The amount for 1 year and 6 months can be calculated by first calculating the amount for 1 year using the compound interest formula, and then calculating the simple interest for 6 months on the amount obtained at the end of 1 year.

First, the amount for 1 year has to be calculated

Amount, A = P(1 + R/100)^{n}

= 80000(1 + 10/100)^{1}

= 80000 x 11/100

= â‚¹ 88000

By taking â‚¹ 88,000 as principal, the S.I. for the next Â½ year will be calculated as

S.I. = (P x R x T)/100

= (88000 x 10 x Â½)/100

= â‚¹ 4400

Interest for the first year = â‚¹ 88000 â€“ â‚¹ 80000 = â‚¹ 8000

And interest for the next Â½ year = â‚¹ 4,400

Total C.I. = â‚¹ 8,000 + â‚¹ 4,400 = â‚¹ 12,400

A = P + C.I.= â‚¹ (80000 + 12400)

= â‚¹ 92,400

(ii) The interest is compounded half yearly

Rate = 10% per annum = 5% per half year

There will be three half years in 1Â½ years

Amount, A = P(1 + R/100)^{n}

= 80000(1 + 5/100)^{3}

= 80000(105/100)^{3}

= â‚¹ 92610

Thus, the difference between the amounts = â‚¹ 92,610 â€“ â‚¹ 92,400 = â‚¹ 210

**7. Maria invested â‚¹ 8,000 in a business. She would be paid interest at 5% per annum compounded annually. Find**

**(i) The amount credited against her name at the end of the second year**

**(ii) The interest for the 3 ^{rd} year**

**Solution:**

(i) P = â‚¹ 8,000

R = 5% per annum

n = 2 years

Amount, A = P(1 + R/100)^{n}

= 8000(1 + 5/100)^{2}

= 8000(105/100)^{2}

= â‚¹ 8820

(ii) The interest for the next one year, i.e. the third year, has to be calculated. By taking â‚¹

8,820 as principal, the S.I. for the next year will be calculated.

S.I. = (P x R x T)/100

= (8820 x 5 x 1)/100

= â‚¹ 441

**8. Find the amount and the compound interest on â‚¹ 10,000 for 1Â½ years at 10% per annum, compounded half yearly. Would this interest be more that the interest he would get if it was compounded annually?**

**Solution:**

P = â‚¹ 10,000

Rate = 10% per annum = 5% per half year

n = 1Â½ years

There will 3 half years in 1Â½ years

Amount, A = P(1 + R/100)^{n}

= 10000(1 + 5/100)^{3}

= 10000(105/100)^{3}

= â‚¹ 11576.25

C.I. = A âˆ’ P

= â‚¹ 11576.25 âˆ’ â‚¹ 10000

= â‚¹ 1,576.25

The amount for 1 year and 6 months can be calculated by first calculating the amount for 1 year using the compound interest formula, and then calculating the simple interest for 6 months on the amount obtained at the end of 1 year.

Amount, A = P(1 + R/100)^{n}

= 10000(1 + 10/100)^{1}

= 10000(110/100)

= â‚¹ 11000

By taking â‚¹ 11,000 as the principal, the S.I. for the next Â½ year will be calculated as

S.I. = (P x R x T)/100

= (11000 x 10 x Â½)/100

= â‚¹ 550

So, the interest for the first year = â‚¹ 11000 âˆ’ â‚¹ 10000 = â‚¹ 1,000

Hence, Total compound interest = â‚¹ 1000 + â‚¹ 550 = â‚¹ 1,550

Therefore, the interest would be more when compounded half yearly than the interest when compounded annually.

**9. Find the amount which Ram will get on â‚¹ 4,096, he gave it for 18 months at 12Â½ per annum, interest being compounded half yearly.**

**Solution:**

P = â‚¹ 4,096

R = 12Â½ per annum = 25/2 per annum = 25/4 per half year

n = 18 months

There will be 3 half years in 18 months

Therefore, amount A = P(1 + R/100)^{n}

= 4096(1 + 25/(4 x 100))^{3}

= 4096 x (1 + 1/16)^{3}

= 4096 x (17/16)^{3}

= â‚¹ 4913

Therefore, the required amount is â‚¹ 4,913.

**10. The population of a place increased to 54000 in 2003 at a rate of 5% per annum**

**(i) find the population in 2001**

**(ii) what would be its population in 2005?**

**Solution:**

(i) Itâ€™s given that, population in the year 2003 = 54,000

54,000 = (Population in 2001) (1 + 5/100)^{2}

54,000 = (Population in 2001) (105/100)^{2}

Population in 2001 = 54000 x (100/105)^{2}

= 48979.59

Therefore, the population in the year 2001 was approximately 48,980

(ii) Population in 2005 = 54000(1 + 5/100)^{2}

= 54000(105/100)^{2}

= 54000(21/20)^{2}

= 59535

Therefore, the population in the year 2005 would be 59,535.

**11. In a laboratory, the count of bacteria in a certain experiment was increasing at the rate of 2.5% per hour. Find the bacteria at the end of 2 hours if the count was initially 5,06,000.**

**Solution:**

The initial count of bacteria is given as 5,06,000

Bacteria at the end of 2 hours = 506000(1 + 2.5/100)^{2}

= 506000(1 + 1/40)^{2}

= 506000(41/40)^{2}

= 531616.25

Therefore, the count of bacteria at the end of 2 hours will be 5,31,616 (approx.).

**12. A scooter was bought at â‚¹ 42,000. Its value depreciated at the rate of 8% per annum. Find its value after one year.**

**Solution:**

Principal = Cost price of the scooter = â‚¹ 42,000

Depreciation = 8% of â‚¹ 42,000 per year

= (P x R x T)/100

= (42000 x 8 x 1)/100

= â‚¹ 3360

Thus, the value after 1 year = â‚¹ 42000 âˆ’ â‚¹ 3360 = â‚¹ 38,640.

## NCERT Solutions for Class 8 Maths Chapter 8- Comparing Quantities Summary

Chapter 8 of NCERT Class 8 Maths deals with the concept of ratios and percentages, along with other main topics and concepts.

The major concepts covered in this chapter include:

8.1 Recalling Ratios and Percentages

8.2 Finding the Increase or Decrease Per Cent

8.3 Finding Discounts

8.3.1 Estimation in percentages

8.4 Prices Related to Buying and Selling (Profit and Loss)

8.4.1 Finding cost price/selling price, profit % loss %

8.5 Sales Tax/ Value Added Tax

8.6 Compound Interest

8.7 Deducing a Formula for Compound Interest

8.8 Rate Compounded Annually or Half Yearly (Semi-Annually)

8.9 Applications of Compound Interest Formula

### Access exercise-wise NCERT Solutions for Class 8 Maths Chapter 8 from the below links:

Exercise 8.1 Solutions 6 Questions (1 Long Answer Questions, 5 Short Answer Questions)

Exercise 8.2 Solutions 10 Questions (4 Long Answer Questions, 6 Short Answer Questions)

Exercise 8.3 Solutions 12 Questions (6 Long Answer Questions, 6 Short Answer Questions)

### NCERT Solutions for Class 8 Maths Chapter 8- Comparing Quantities

Chapter 8 of NCERT Solutions for Class 8 Maths is really important to learn as the basic knowledge of tax, interest, profit, loss and much more are conveyed in this chapter. The concepts discussed in this Chapter are:

- Discount is a reduction given on marked price. Discount = Marked Price â€“ Sale Price.
- Discount can be calculated when the discount percentage is given. Discount = Discount % of the Marked Price
- Additional expenses made after buying an article are included in the cost price and are known as overhead expenses. CP = Buying price + Overhead expenses
- Sales tax is charged on the sale of an item by the government and is added to the Bill Amount. Sales tax = Tax% of Bill Amount.
- GST stands for Goods and Services Tax and is levied on the supply of goods or services or both.
- Compound interest is the interest calculated on the previous yearâ€™s amount (A = P + I)

### Key Features of NCERT Solutions for Class 8 Maths Chapter 8- Comparing Quantities

Learning the chapter Comparing Quantities enables the students to:

- Slightly advanced problems involving applications on percentages, profit & loss, overhead expenses, Discount, tax.
- Difference between simple and compound interest (compounded yearly up to 3 years or half-yearly up to 3 steps only), arriving at the formula for compound interest through patterns and using it for simple problems.
- Direct variation â€“ Simple and direct word problems
- Inverse variation â€“ Simple and direct word problems
- Time & work problemsâ€“ Simple and direct word problems

## Frequently Asked Questions on NCERT Solutions for Class 8 Maths Chapter 8

### List out the concepts present in Frequently Asked Questions on NCERT Solutions for Class 8 Maths Chapter 8?

The major concepts are listed below:

8.1 Recalling Ratios and Percentages

8.2 Finding the Increase or Decrease Per Cent

8.3 Finding Discounts

8.3.1 Estimation in percentages

8.4 Prices Related to Buying and Selling (Profit and Loss)

8.4.1 Finding cost price/selling price, profit % loss %

8.5 Sales Tax/ Value Added Tax

8.6 Compound Interest

8.7 Deducing a Formula for Compound Interest

8.8 Rate Compounded Annually or Half Yearly (Semi Annually)

8.9 Applications of Compound Interest Formula