Answer :
The rule of 72 is a helpful investment rule-of-thumb that tells you approximately how many years it takes for a sum of money to double in size. This rule is based on the assumption that the rate of return on your investment is constant.
To use the rule of 72, simply divide the interest rate of your investment by 72. For example, if you are earning a 6% return on your investment, it will take approximately 12 years for your investment to double (6% divided by 72 = 12).
A simple method for estimating how long it will take for an investment to double based on its fixed yearly rate of return is the Rule of 72. You may calculate roughly how long it will take for your portfolio to double in size by dividing 72 by the fixed rate of return.
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