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

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 ?

Find the time in which the simple interest on a sum of money will be (4)/(5) times the principal at 8% per anuum.

The simple interest on a certain sum of money at the rate of 5% p.a. for 8 years is Rs 840. At what rate of interest the same amount of interest can be received on the same sum after 5 years? (a) 6% (b) 8% (c) 9% (d) 10%

The difference between the compound interest and the simple interest on a certain sum for 2 years at 6% per annum is Rs 90. Find the sum.

The simple interest on a certain sum of money is 3/8 of the sum in 6""1/4 years. Find the rate percent charged.