Interest. Find the interest in the 4th year.

(14) The maturity amount of Rs. 24,33,600 at 20% p.a. compound interest after 2years is same as the maturity amount of a sum at 30% p.a. compoundinterest after 2 years. Find the sum.(15)) A person left Rs.302 52 500 for herwho were 16 and 15 years