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:
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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