The amount doubles itself under Compound interest in 15 years. In how many years will it become 256 times of itself at the same rate of interest?

The difference between the simple and the compound interest on a certain sum of money for 3 years at 10% p.a is Rs. 77.50. Find the sum.

What is the rate percent and time needed, both of them being equal in value, for the simple interest on a certain sum to be 36 over 100 of that sum?

Find the compound interest on ₹ 31250 for 9 months at 16% per annum when the interest is calculated quarterly.

Ravi lent ₹12,000 to his friend at a simple interest rate of 8% per annum. After how many years will the total amount become ₹16,800 ?

Mr.Jacob invested Rs. 17,500 dividing into two different schemes A and B at simple interest rate of 20% and 7.5% respectively. If the total amount of the simple interest earned in 2 years is Rs.3775, what was the amount invested in scheme A? (In Rs.)

A sum of money at simple interest amounts to Rs.7395 in 3 years and to Rs.8160 in 4 years. Find the sum. (In Rs.)

What is the difference between the compound interests on Rs.15000 for 1 year at 6% per annum compounded yearly and half-yearly? (In Rs.)

At the end of two years what will be the compound interest at the rate of 10% p.a. on an amount of Rs.7200? (In Rs.)

Find the simple interest on Rs.11400 at 45% per annum for 6 months. (In Rs.)

What sum (in ₹) will earn a simple interest of ₹840 in 3 years at 20% per year rate of interest?