Find:

(a) 15% of 250 (b) 1% of 1 hour

(c) 20% of Rs 2500 (d) 75% of 1 kg

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Solution

(a) $15 %$ of $250 = \frac{15}{100} \times 250 = \frac{75}{2} = 37.5$
(b)1 hour= 60 minutes
$1 %$ of $60$ minutes $(= 1$ hour $) = \frac{1}{100} \times 60 = \frac{3}{5}$ minutes
(c) $20 %$ of $R s 2500 = \frac{20}{100} \times 2500 = R s . 500$
(d) $75 %$ of $1 k g = \frac{75}{100} \times 1 = 0.75 k g = (0.75 \times 1000) g = 750 g$

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Question 12
Aruna has only Rs. 1 and Rs.2 coins with her. If the total number of coins that she has is 50 and the amount of money with her is Rs.75, then the number of Rs. 1 and Rs. 2 coins are, respectively
(A) 35 and 15
(B) 35 and 20
(C) 15 and 35
(D) 25 and 25

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(a) 35 − (20) (b) 72 − (90)

(e) 23 − (− 12) (f) (− 32) − (− 40)

Q. Calculate the median from the following data:

Rent (in Rs.):	15−25	25−35	35−45	45−55	55−65	65−75	75−85	85−95
No. of Houses:	8	10	15	25	40	20	15	7

Question 4 (d)
Find
d) $75 % o f 1 k g$

Q. Find:
(i)

20 %

R s . 2500

(ii)

22 %

16000

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Find: (a) 15% of 250 (b) 1% of 1 hour (c) 20% of Rs 2500 (d) 75% of 1 kg

(a) 15% of 250=15100×250=752=37.5(b)1 hour= 60 minutes1% of 60 minutes (=1 hour)=1100×60=35 minutes(c) 20% of Rs 2500=20100×2500=Rs. 500 (d) 75% of 1 kg=75100×1=0.75 kg=(0.75×1000) g=750 g

Find:

(a) 15% of 250 (b) 1% of 1 hour

(c) 20% of Rs 2500 (d) 75% of 1 kg