A certain amount of money at compound interest grows to ₹66,550 in 3 years and ₹73,205 in 4 years. The rate per cent per annum is:

9% 5% 11% 10%

10%

Amount after 3 years = 66550 Amount after 4 years = 73205 Interest earned = 73205 - 66550 = 6655 Rate of interest = \(\frac{6655}{66550}\) × 100% = 10%