Find the rate of simple interest per annum, if a sum borrowed becomes double in 5 years.

Find the rate of simple interest per annum. If the sum borrowed becomes 3 times itself in 12 years.

At what rate of simple interest in percent per annum , a some of money becomes double in 15 years?

A sum becomes 14 times of itself in 15 years at the rate of simple interest per annum. In how many years will the sum becomes 92 times of itself?

Find the rate of simple interest in percent per annum if the simple interest of a principal is 3/5 part of the amount in 10 years.

A man who borrowed a certain sum agrees to repay it by paying Rs. 4032 at the end of the first year and Rs. 10075 at the end of the second year. If the rate of simple interest is 12% per annum, find the sum borrowed.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of Rs 1248 in 7 years and or Rs 1056 in 4 years. Find the principal and rate of simple interest in percent per annum.

At what rate of interest per annum will a sum double itself in 8 years ?