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?

The simple interest accrued on an amount of Rs 16500 at the end of 3 years is Rs. 4950. What would be the compound interest accrued on the same amount at the same rate in the same period? 

A took a certain sum as loan from bank at a rate of 8 % Simple Interest per annum. A lends the same amount to B at 12 % Simple interest per annum. If at the end of the five years. A made profit of Rs 800 form the deal, how much was the original sum? 

If the difference between CI and SI for 3 years at the rate of 10% is Rs 31. Find the principle.

A person invested Rs 28000 at the rate of 8% per annum simple interest and Rs 26000 at the rate of 10% per annum compounded Interest compounded annually. What is the difference in the interest earned from two investments at the end of 3 years? 

If certain sum, at simple interest turns into thrice of actual amount in 4 years. Find out time to become the amount thirteen times of initial amount? 

A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years.:

If the annual rate of simple interest increases from 8% to 13%, a man’s yearly income increases by Rs. 4800. His principal (in Rs.) is: