The "rule of 72" is a simplified way to help you to estimate how long it will take for your money/investment to double with a given annual rate of interest. For example, if you expect to earn 4% interest rate on your money, it will take 18 years to double your money. How to get this? Just divide 72 by 4, you would get 18 years.
The "rule of 72" can also help you to figure out how much interest rate required to double your money/investement in a certain number of years. For example, if you want your investment to double in 10 years, you need to earn 7.2%. How to get this? Simply divide 72 by 10, you would get 7.2%.
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