A sum of money lent at compound interest amounts to ₹1815 in two years and to ₹ 1996.50 in three years then find the sum and rate %.

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Between 2 and 3 years the money has increased to 1996.5/1815=1.1 which is an increase of 0.1 or 10%.

If P is the original sum then 1815=P(1.1)² and P=1815/1.21=₹1500.

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