Calculate the amount and the compound interest on ₹ 15,000 for 2 years compounded annually, the rates of interest for successive years being 8% and 9% per annum 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.

Find the amount and the compound interest on ₹ 10,000 for 1 year at 12% per annum, compounded half-yearly.