Rule of 72
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From Wikipedia, the free encyclopedia In finance, the rule of 72, the rule of 70[1] and the rule of 69.3 are methods for estimating an investment's doubling time. The rule number (e.g., 72) is divided by the interest percentage per period (usually years) to obtain the approximate number of periods required for doubling. Although scientific calculators and spreadsheet programs have functions to find the accurate doubling time, the rules are useful for mental calculations or when only a basic calculator is available.[2] These rules apply to exponential growth and are therefore used for…
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