Find the compound interest at the rate of 10% per annum for two years on that principal which in two years at the rate of 10% per annum given Rs. 200 as simple interest.

Mewa lal borrowed Rs. 20000 from his friend Rooplal at 18% per annum simple interest. He lent it to Rampal at the same rate but compounded annually. Find his gain after 2 years.

Find the compound interest on Rs. 8000 for 9 months at 20% per annum compounded quarterly.

Find the compound interest on Rs. 64000 for 1 year at the rate of 10% per annum compounded quarterly.

Ramesh deposited Rs. 7500 in a bank which pays him 12% interest per annum compounded wuarterly. What is the amount which he receives after 9 months.