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.

Calculate the compound interest for the second year on ₹ 8000 invested for 3 years at 10% per annum.

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.

How much will ₹ 50000 amount to in 3 years compounded yearly, if the rates for the successive years are 6%, 8% and 10% respectively.