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    Rule of 72

    Equation

    T_d = 70/i | T_d | investment doubling time i | interest rate (formula represents an approximation to the exact computation)

    Input value

    interest rate | 7%

    Result

    investment doubling time | 10 years = 3650 days = 87600 hours

    Precise investment doubling time

    10.24 years (assuming continuous compounding)

    Investment doubling time vs. interest rate

    Investment doubling time vs. interest rate

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