Shanthi borrowed Rs.75,000.00 from two banks at compound interest compound annually. One bank charges interest at the rate of 15% per year and the other bank at 20% per year. If at the end of the year, shanthi paid Rs.12,000.00 as the total interest to the two banks, how much did she borrow from the second bank

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Solution

$A = P \times (1 + \frac{r}{100})$
$= 75000 \times \frac{(100 + r)}{100} = \frac{(75000 + 12000)}{87000}$
$100 + r = 116 \Rightarrow r = 16 %$ .
$15.....20..... 16$
Ratio $4 : 1$
Total parts $= 5$
$O n e$ part $= \frac{75000}{5} = 15000$

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A=P×(1+r100)=75000×(100+r)100=(75000+12000)87000 100+r=116⇒r=16%.15.....20.....16 Ratio 4:1 Total parts=5 One part=750005=15000

$A = P \times (1 + \frac{r}{100})$
$= 75000 \times \frac{(100 + r)}{100} = \frac{(75000 + 12000)}{87000}$
$100 + r = 116 \Rightarrow r = 16 %$ .
$15.....20..... 16$
Ratio $4 : 1$
Total parts $= 5$
$O n e$ part $= \frac{75000}{5} = 15000$