A technique for estimating the number of years or the interest rate necessary to double your money. Divide 72 by the interest rate and you will have the approximate number of years needed to double your money. If your money earns 4%, your money will double in 18 years (72 divided by 4). If you earn 8%, your money will double in 9 years (72 divided by 8).
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For the past 52 years, Harold Averkamp (CPA, MBA) has
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