A sum of ₹800 amounts to ₹920 in 3 years at simple interest. If the interest rate is increased by 3%, what would it amount to in the same time period?

A sum of money at simple interest amounts to ₹815 in 3 years and to ₹854 in 4 years. What is the sum?

The simple interest on a sum of money is 4/9 of the principal. If the number of years is equal to the rate percent per annum, find the rate percent.

A sum of ₹12,500 amounts to ₹15,500 in 4 years at simple interest. What is the rate of interest?