# More Examples of Simple Interest

To Find Principal
When interest, time, rate are given:

Example 01:
What amount was borrowed, for which amount of interest is 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 Principal
When amount, rate, time are given:

Example 02:
If the amount for 2 years at 6% is 4,000, what was the principal?
Solution:
Let P = Principal, Rate = 6%, n = 2, A = 4,000
We know that

To Find Rate
When interest, time, principal are given:
Example 03:
The amount of simple interest for Rs.15,000 for 2 years is 1000, find rate of interest.
Solution:
Let Principal = 15,000, Simple interest = I = 1000, Time = 2 years
Interest = P r n