The CI on a certain sum for 2yrs at 10 percent/annum is Rs. 525. The SI on the same sum for double the time at 1/2 the rate % per annum is:  Answers.
A) Rs. 100	B) Rs. 300	C) Rs. 400	D) Rs. 500	E) Rs. 550
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   Rs. 500
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The CI on a certain sum for 2yrs at 10 percent/annum is Rs. 525. The SI on the same sum for double the time at 1/2 the rate % per annum is: