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 ?

Let the sum be Rs. P. Then,

$P1+\frac{25}{2x100}2-P$= 510

P[ $\frac{9}{8}2$- 1] = 510.

Sum = Rs. 1920

So, S.I. = (1920 x 25 x 2) / (2 x 100) = Rs. 480