Meenal lends ₹ 75000 at C.I. for 3 years. If the rate of interest for the first two years is 15% per year and for the third year it is 16%, calculate the sum Meenal will get at the end of third year.

Calculate the amount and the compound interest on ₹ 16000 in 3 years, when the rates of interest for successive years are 10%, 14% and 15% respectively.

A borrowed ₹ 2500 from B at 12% per annum compound interest. After 2 years, A gave ₹ 2936 and a watch to B to clear the account. Find the cost of the watch.