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Compound Interest

Q1: The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525. The simple interest on the same sum for double the time at half the rate percent per annum is:

A Rs. 400

B Rs. 500

C Rs. 600

D Rs. 800

ANS:B - Rs. 500

Let the sum be Rs. P.

Then, P 1 + 10 2 - P = 525
100
P 11 2 - 1 = 525
10
 P = 525 x 100 = 2500.
21
 Sum = Rs . 2500.
So, S.I. = Rs. 2500 x 5 x 4 = Rs. 500
100



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