If a sum of money double itself in 20 years. What is the rate of simple interest per cent per year?

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Accepted Answer

Let the principal = Rs. P ⇒ Amount = Rs. 2P ⇒ Interest = 2P - P = Rs.P ∴ Rate = (interest x 100) / (Principal x 20) = (P x 100) / (P x 20) = 5%

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