The Rule Of 72 Math
By dividing 72 by the annual rate of return you can get a rough estimate of the number of years it will take to double your initial investment.
The rule of 72 math. So for example if the interest rate is 10 72 10 7 2 years. The rule of 72 is an easy way to estimate how long it will take for an investment to double given a fixed annual interest rate. 72 8 9 years. The rule of 72 works as follows.
The rule of 72 is a mathematical way to estimate the number of years it will take for your money to double with compounding interest. So it will take just over 7 years to double our money. If the interest rate is 8 to double our money it will take. Years to double 72 interest rate this formula is useful for financial estimates and understanding the nature of compound interest.
If we want to know how long it will take for our money to double just divide 72 by the interest rate.