What is the difference in the amount of interest earned by a person who invests Rs 5,000 for two years under two alternate schemes: Scheme 1 offers 15% annual interest on a simple interest basis, and Scheme 2 offers 14% annual interest compounded annually?

The difference between simple interest and compound interest (compounded half-yearly) on a sum at the rate of 25% per annum for 1 year is ₹ 4,375. What is the principal amount?

A person invested half of his capital at 10% simple interest and the other half at 10% compound interest (compounded annually) for 2 years. If the total interest earned is ₹ 4,100, find his total capital.