Calculate the amount and the compound interest on ₹ 25,000 for 3 years compounded annually, the rates of interest for successive years being 8%, 9% and 10% respectively.

Peter invested ₹ 2,40,000 for 2 years at 10% per annum compounded annually. If 20% of the accrued interest at the end of each year is deducted as income tax, find the amount he received at the end of 2 years.

The simple interest on a sum of money for 2 years at 10% p.a. is ₹ 1,700. Find:

(i) the sum of money,

(ii) the compound interest on this sum for 1 year, payable half yearly at the same rate.