The rule of 70 states that an investment will double in 70/x years, where x is the annual rate of return rate.

Question

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The rule of 70 is a quick way to estimate how long it will take an investment to double in value. It states that the number of years it takes for an investment to double is approximately equal to 70 divided by the annual rate of return. So, if the annual rate of return is 7%, it will take approximately 10 years for the investment to double (70/7=10).

The Rule of 70 States That an Investment Will Double