If the compound interest for the $$3^{rd}$$ and $$4^{th}$$ year on a certain principal is Rs 125 and Rs 135 respectively, what is the rate of interest (in %)?
Solution
Interest for 4- years= ₹ 135
Interest for 3- years= ₹ 125.
Therefore interest for ₹ 125 for 1- year =₹10
So interest for ₹ 100 for 1- year =(10/125) x100 = ₹8