Compound Interest - General Questions

Find the amount on Rs. 3,000 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.

Find the compound interest on Rs. 11,200 at 8% per annum for 1 year, compounded half-yearly.

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

The difference between compound interest and simple interest on a certain sum at 12% per annum for 2 years is Rs. 141.12. What is the sum?