A principal increase by 50 percent in five years at the rate of simple interest. What will be the compound interest for 3 years at Rs 20,000 with the same interest rate?

A sum of money amounts to 5,200 in 5 years and to 5,680 in 7 years at simple interest. The rate of interest per annum is-

The difference between simple interest and compound on Rs. 1200 for one year at 10% per annum reckoned half-yearly is:

At what annual percentage rate, 10 years of simple interest on an amount will be $$ {2\over 5}$$ of the addition?

If the simple interest on ₹ 1 for 1 month is 1 paisa, then the rate percent per annum will be 

The simple interest on an amount at the rate of 13.5 p.c.p.a. for 10 years is Rs. 765.45. What is the sum?

A person invests money in three different schemes for 6 years, 10 years and 12 years at 10%, 12% and 15% simple interest respectively. At the completion of each scheme, he gets the same interest. The ratio of his investments is-

The simple interest and the true discount on a certain sum for a given period and at a given rate are 25 and 20 respectively. The sum is