The C.I. on a certain sum for 2 years at 10% per annum is Rs. 525. The S.I. on the same sum for double the time at half the rate percent per annum is?	Choose the correct choice from the following answers:
A) Rs. 400  B) Rs. 500  C) Rs. 600  D) Rs. 800  E) Rs. 850
Explanation:   Let the sum be Rs. P. Then,   [P(1 + 10/100)2 - p] = 525   P[(11/10)2 - 1] = 525   P = (525 * 100) / 21= 
<gadget id="calculator">(525 * 100) / 21</gadget>
<output>2_500</output>
2500   Sum= Rs. 2500   So, S.I. = (2500 * 5 * 4)/100 = Rs. 500   ANSWER IS Rs. 500
<result>B</result>
The C.I. on a certain sum for 2 years at 10% per annum is Rs. 525. The S.I. on the same sum for double the time at half the rate percent per annum is?