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The Rule of 72

A simple way to estimate the time it will take for a sum of money to double is to use the rule of 72. Basically, you divide 72 by the interest rate, per year and the result is the number of years it will take for your money to double. For example: $10 000 invested at a 3% interest rate will take 24 years to become $20 000. Invested at 8%, it will take 9…

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