Simple Interest

For the such rate of Interest, the ratio of amount for one year under simple interest and for two years under compound interest compounded annually is 3:4. Find the rate of intrest:

In how many years will a sum of money doubles itself at 6%% per annum simple intrest?

A sum of 7,700 is lent on simple interest in two parts in such a way that the interest on the first part at 20% p.a. for 5 years is equal to the interest on the other part at 9% p.a. for 6 years. Find the smaller part of the sums lent in two parts.

A certain sum fetched simple interest of ₹3200 at the rate of 6.25% per annum in 4 years. What is the sum?

On simple interest a person invested one-fourth of his capital at 8%, one-third at 6% and the remaining at 10%. If his annual income is ₹735, then the capital is :

What sum of money will become Rs 520 in 5 years and to Rs 568 in 7 years with the same rate of simple interest?

Find in how many years will a sum double itself when given on 5% simple interest.