What is the simple interest on the same sum for triple the time at half the rate percent per annum?

Question

The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525.
What is the simple interest on the same sum for triple the time at half the rate percent per annum?

Answer 1

[Principle*1.1^2] - Principle = 525
Principle(1.1^2 - 1) = 525
Principle = 525/0.21 = 2500.

Simple interest for t = 6 years and 5% Rate of interest = 2500*6*5/100 = 750.