A certain sum becomes 3 fold at 4% annual rate of interest.At what rate,it will become 6 fold?

A certain sum becomes doubled in 5 years. Find the rate of interest.

A certain sum becomes 8 fold in 15 yr at simple interest. What will be the rate of interest?

A sum becomes 6 fold at 5% per annum. At what rate, the sum becomes 12 fold?

A sum becomes two fold in 6 yr at a certain rate of interest. Find the time, in which the same amount will be 10 fold at the same rate of interest.

In a certain time, a sum becomes 3 times at the rate of 5% per annum. At what rate of interest, the same sum becomes 6 times in same duration?

In a certain time, a sum becomes 4 times at the rate of 5% per annum. At what rate of simple interest, the same sum becomes 8 times in the same duration?

If certain sum becomes 3 times itself in 4 years at compound interest, in how many years will the sum become 81 times itself at the same rate of interest?

2400 becomes 2976 in 3 years at a certain rate of simple interest. What sum of money will become 5016 in 4 years at the same rate of interest?