In what time a capital becomes five times at the interest rate of `10%.`

In what time does money becomes double at simple interest rate of 12% per annum?

In what time does a sum of money becomes 4 times of itself at simple interest rate of 15% per annum .

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?

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 of money becomes five times it self if the rate of the interset is 16% p.a. Then the certain time (in years) is :

In what time does a sum of money becomes 3.6 times of itself at simple interest rate of 13% per annum.

In what time, does a sum of money become four fold at the simple interest rate of 10% per annum?

A sum becomes 1.6 times of itself in five years at simple rate of interest. Find rate of interest per annum?