The rule of 72

The rule of 72 is used to find the number of years it takes to double your money at a given interest rate.

(72/[interest rate]) = years until a principle doubles

So, how long will it take to double your money at eight percent interest? Divide 8 into 72 and you get 9 years.

If you collect 7% on your savings in a little over 10 years the amount will be double what it is today.

The rule of 72 also means that you can determine the time it takes for a population to double if it is growing at a steady rate by solving this function:

(72/[rate of growth]) = years for population to double

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What is room temperature anyway?

Room temperature is considered to be 72 degrees Fahrenheit

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