# More Examples of Simple Interest

To find the principal when interest, time, and rate are given:

Example 01:
What amount was borrowed, for which the amount of interest is Rs.200 at the rate of 5% for 4 years?

Solution:
Let P = Principal , Rate = 5%, Interest = 200, time = n = 4, I = Interest

We know that

To find the principal when amount, rate, and time are given:

Example 02:
If the amount if interest for 2 years at 6% is Rs.4,000, what was the principal?

Solution:
Let P = Principal, Rate = 6%, n = 2, A = 4,000

We know that

To find the rate when interest, time, and principal are given:
Example 03:
The amount of simple interest for Rs.15,000 for 2 years is 1000, find the rate of interest.

Solution:
Let Principal = 15,000, Simple interest = I = 1000, Time = 2 years
Interest = P r n