Compound Interest - General Questions

What is the compound interest on Rs. 15,600 at 15% per annum for 2 years, compounded annually?

The difference between compound interest and simple interest on a certain sum at 15% per annum for 2 years is Rs. 51.75. What is the sum?

Find the amount on Rs. 18,000 for 3 years at 10% per annum compounded annually.

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

The difference between compound interest and simple interest on a certain sum at 10% per annum for 2 years is Rs. 106. What is the sum?