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A Borrowed Rs. 2,500 from B at 12% per Annum Compound Interest. After 2 Years, a Gave Rs. 2,936 and a Watch to B to Clear the Account. Find the Cost of the Watch.

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Question

A borrowed Rs. 2,500 from B at 12% per annum compound interest. After 2 years, A gave Rs. 2,936 and a watch to B to clear the account. Find the cost of the watch.

Sum
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Solution

For 1st year,
P = Rs. 2500
R = 12%
T = 1 year

I = `[ 2500 xx 12 xx 1 ]/[ 100 ]` = Rs. 300.

Amount = 2500 + 300 = Rs. 2800

For 2nd year,
P = Rs. 2800
R = 12%
T = 1 year

I = `[ 2800 xx 12 xx 1 ]/100` = Rs. 336

Amount = 2800 + 336 = Rs. 3136

Amount repaid by A to B = Rs. 2936

The amount of watch =Rs. 3136 - Rs. 2936 = Rs. 200

shaalaa.com
Concept of Compound Interest - Compound Interest as a Repeated Simple Interest Computation with a Growing Principal
  Is there an error in this question or solution?
Chapter 2: Compound Interest (Stage 1) [Basic Concepts] - Exercise 2 (A) [Page 28]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 2 Compound Interest (Stage 1) [Basic Concepts]
Exercise 2 (A) | Q 6 | Page 28

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