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Question 10 a Man Borrows Rs. 10,000 at 5% per Annum Compound Interest. He Repays 35% of the Sum Borrowed at the End of the First Year and 42% of the Sum Borrowed at the End of the Second Year.

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Question

A man borrows Rs. 10,000 at 5% per annum compound interest. He repays 35% of the sum borrowed at the end of the first year and 42% of the sum borrowed at the end of the second year. How much must he pay at the end of the third year in order to clear the debt ?

Sum
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Solution

For the first year,

P1 = 10,000, R = 5%

I1 = `(10,000 xx 5 xx 1)/100`

I1 = 500

A1 = 10,000 + 500 = Rs. 10,500.

At the end of the first year, he repays 35% of the sum borrowed so he repays the amount

`= 10,500 - 35%` of 10,000

= 10,500 - `35/100 xx 10,000` 

= 10,500 - 3,500

= Rs. 7,000.

For the second year,

P2 = Rs. 7000, R = 5%

I2 = `(7,000 xx 5 xx 1)/100` = 350

A2 = 7000 + 350 = Rs. 7,350

At the end of the second year, he repays 42% of the sum borrowed so he repays the amount =

= 7,350 - `42/100 xx 10,000` 

= 7350 - 4200

= Rs. 3150

For the Third year

P3 ​= Rs. 3150, R = 5%

I3 ​=`(3150 xx 5 xx 1)/100` = 157.5

A3 = 3150 + 157.5 = Rs. 3307.50

Hence he pays Rs. 3307.50 at the end of the third year in order to clear the debt.

shaalaa.com
Concept of Compound Interest - Compound Interest as a Repeated Simple Interest Computation with a Growing Principal
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Chapter 2: Compound Interest (Stage 1) [Basic Concepts] - Exercise 2 (B) [Page 33]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 2 Compound Interest (Stage 1) [Basic Concepts]
Exercise 2 (B) | Q 10 | Page 33

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