At what rate of simple interest per annum in percent the interest of a principal in `20` years will be `(4)/(9)` part of its amount ?

At what rate of simple interest per annum in percent, the ratio of a principal and its amount will be 50 : 59 after 3 years?

What is the rate of simple interest per annum, when the interest of some money in 2 year will be 1/3 part of its maount ( principal along with interest )?

What is the rate of simple interest per annum, when the interest of some money in 4 years will be 8/25 part of its principal?

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.

At what rate of simple interest in percent per annum, the ratio of principal and its interest after 20 years is 1:1 ?

Find the rate of simple interest in percent per annum, if a principal becomes (4)/(9) part of its amount in a period of time of 20 years.

The simple interest of a principal in 1 year and 9 months at the rate of simple interest of 5% per annum is 63Rs more than of the same principal in 2 years and 4 months at the rate of simple interest of 4(1)/(2)% per annum. Find the principal.

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

A principal becomes twice its amount in 20 years at a certain rate of simple interest. At the same rate of simple interest, that principal becomes thrice of its amount in