The Rule of 72. It’s a simple formula to estimate how long your money will take to double through compound interest. Divide 72 by your investment's annual return percentage, and you’ll get the approximate number of years it will take. For example, if your investment earns 8% annually, 72 ÷ 8 = 9 years for your money to double. If you increase that return to 12%, your money doubles in just 6 years. This rule shows the magic of compound growth and why starting early and aiming for higher returns can significantly accelerate your wealth-building.
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