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.

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.

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

A certain principal amounts Rs2750 in 2 years at a rate of simple interest of 5% per annum. Then find the rate of simple interest in percent per annum for which the principal amounts Rs3000 in 2 years.

If a principal beocmes Rs 560 in 3 years and Rs 600 in 5 years at the same rate of simple interest in percent per annum, then find the principal and the rate of simple interest in percent per annum.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of Rs 1248 in 7 years and or Rs 1056 in 4 years. Find the principal and rate of simple interest in percent per annum.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of 7100Rs in 7 years and of 6200Rs in 4 years. Determine the principal and rate of simple interest in percent per annum.

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