If the C.I. on a sum for 2 years at 12 1/2 % per annum is Rs. 510, the S.I. on the same sum at the same rate for the same period of time is? Choose the correct choice from the following options
A) Rs. 400
B) Rs. 450
C) Rs. 460
D) Rs. 480
E) Rs. 580
Let the sum be Rs. P. Then,   [P(1 + 25/(2 * 100))2 - P] = 510   P[(9/8)2 - 1] = 510.   Sum = Rs. 1920   So, S.I. = (1920 * 25 * 2) / (2 * 100) = Rs. 480   ANSWER:Rs. 480
<result>D</result>
If the C.I. on a sum for 2 years at 12 1/2 % per annum is Rs. 510, the S.I. on the same sum at the same rate for the same period of time is?