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Interest Rate Calculation for Doubling Initial Principal

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Suppose that compound interest is earned on a certain investment, with an interest conversion period of six months. Calculate the interest rate "p%" necessary to double the initial principal in four years.

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A complete, neat and step-by-step solution is provided with regards to interest rates calculation for doubling initial principal.

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Let the principal be x. Then the amount at the end of 4 years is 2x.

We use the formula A = P [1 + ...

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