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:
Difference in the interest in 4 years and 3 years = 73205 - 66550 = Rs.6655
Rate percentage = $$\frac{6655}{66550} \times$$ 100 = 10%
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