In what time will the simple interest on a certain sum of money at `6(1)/(4)%` per annum be `(3)/(8` th of itself?

In how much time will the simple interest on certain sum of money at 7(1)/(2)% per annum be (6)/(5) of itself ?

In how much time will the simple interest on certain sum of money at 12(1)/(2)% per annum be (7)/(4) of itself ?

.In what time will the interest on a certain sum of money at 6% be (5)/(8) of itself?

In what time will the interest on a certain sum of money at 6% be 5/8 of itself ?

The simple interest on a certain sum of money at 10% per annum is 6,000 in 2 years. Find the sum

If the difference between the simple interest on a certain sum of money for 4 years at 2 (1)/(2) % per annum and the simple interest on the same sum for the same period at 3% per annum is Rs 60, then find the sum.

If the simple interset on a certain sum of money afte 6 (1)/(4) years is (3)/(8) of the principal, then find the rate of interest per annum.

At what rate per annum will the simple interest on a certain sum of money be 1/5 of the amount in 10 yr?