Find the C.I. on Rs. 15,225 for 9 months at 16% per annum compounded quarterly ?

P = Rs. 15225, n = 9 months = 3 quarters, R = 16% p.a. per quarter.

Amount =  $15225x1+\frac{4}{100}3$

= (15225 x 26/25 x 26/25 x 26/25) = Rs. 17126.05

=> C.I. = 17126 - 15625 = Rs. 1901.05.