A sum of amount at certain rate of compound interest doubles in 3 years. In 9 years it will be k times of the original principal. Find the value of k.

On a certain sum of money the compound interest Rs. 318 is earned in 2 years. If the rate of interest is 12%, what is the principal amount?

For a certain sum, if the difference between compound interest and simple interest for 2 years at the rate of interest 5% per annum is ₹5, then find the difference between compound interest and simpl…

A sum doubles itself in 2.5 years at compound interest. In how many years will it become eight times?

The difference between Compound Interest and Simple Interest on a certain sum of money for 2 years at 10% per annum is Rs 125. Find the principal sum.

There is 50% increase in an amount in 5 years at simple interest. What will be the compound interest of ₹ 12,000 after 3 years at the same rate?