Simple interest is calculated on the principal amount for a given time period at a given rate of interest. The formula for calculating Simple Interest is as follows:

SI = (P x R x T)/100

Where,

SI = Simple Interest
P = Principal Amount
R = Rate of Interest
T = Time Period

In this question, the principal amount is Rs 9125, the rate of interest is 4% p.a. and the time period is from April 5, 1987 to August 10, 1987.

Now, we will convert the time period from months to years and calculate the simple interest.

Time Period in Years = (August 10, 1987 – April 5, 1987) / 12

Time Period in Years = 4/12

Time Period in Years = 0.33

Therefore, the Simple Interest on Rs 9125 at 4% p.a. for 0.33 years is:

SI = (9125 x 4 x 0.33)/100

SI = Rs 127

Hence, the Simple Interest on Rs 9125 at 4% p.a. from April 5, 1987 to August 10, 1987 is Rs 127.

If you think the solution is wrong then please provide your own solution below in the comments section .