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V.9:2 (80-81): SIDEBAR: DERIVATION OF THE RULE OF 72

V.9:2 (80-81): SIDEBAR: DERIVATION OF THE RULE OF 72

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DERIVATION OF THE RULE OF 72

The mathematics behind the rule of 72, stating that if an amount is invested at a compound interest rate until it doubles in value, then the product of the number of years (or periods) and the interest rate is approximately equal to 72; page 81.
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