A sum of money at compound interest double itself in 15 years. It will become eight times of itself in

A sum of money at simple interest triple itself in 15 years. It will become 5 times of itself in ____

A sum of money invested at compound interest doubles itself in 6 years. At the same rate of interest it will amount to eight times of itself in:

A sum borrowed under compound interest doubles itself in 10 years. When will it become fourfold itself at the same rate of interest?

A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to eight times itself ?

A sum of money placed at compound interest doubles itself in 3 years. In how many years will it amount to four times itself?

A sum of money placed at compound interest doubles itself in 6 years. In how many years will it amount to 16 times itself?

A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to four times itself?

A sum of money invested at compound interest doubles itself in six years. In how many years will it become 64 times itself at the same rate of compound interest?