Compound Interest - General Questions

Find the compound interest on Rs. 4,800 at 20% per annum for 1 year, compounded half-yearly.

Find the compound interest on Rs. 11,200 at 4% per annum for 1 year, compounded half-yearly.

Find the compound interest on Rs. 3,200 at 20% per annum for 1 year, compounded half-yearly.

A sum amounts to Rs. 5,100 in 2 years and to Rs. 5,355 in 3 years at compound interest. What is the rate of interest?

The difference between compound interest and simple interest on a certain sum at 12% per annum for 2 years is Rs. 108. What is the sum?