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.

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

If at the rate of simple interest in percent per annum by which a principal becomes double in 20 years and also amounts to 7Rs20 after 4 years, then find the principal.