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- The rule of 72 is used to
- determine how long it will
- take an investment to double.
- It's easy to use the rule of
- 72. Use either the number of
- years until the money is needed
- or the rate of return you
- expect on the investment.
- Divide either number by 72 and
- you'll determine the number of
- years or the rate of return you
- will need to double your
- investment.
-