Simple interest on a certain sum of money for 3 years at 5% per annum is ₹ 600. Find the amount due and compound interest on this sum at the same rate after 3 years, the interest being reckoned annually.

On what sum of money will the difference between simple interest and compound interest for 2 years at 5% per annum be equal to ₹ 50 ?

A man invests ₹ 3,000 for three years at compound interest. After one year, the money amounts to ₹ 3,240. Find the rate of interest and the amount (to the nearest rupee) due at the end of 3 years.

A sum of ₹ 40,000 was lent for one year at 16% per annum. If the same sum is lent for the same time and at the same rate percent but compounded half-yearly, how much more will the interest be ?