
The Rule of 72: The Mental-Math Shortcut Every Business Owner Should Use Before Investing Retained Earnings
Divide 72 by an annual rate and you get the approximate years for money to double: $50,000 at 9% doubles in 8 years, while a 24% credit card balance doubles what you owe in 3. How business owners can use the Rule of 72 to compare investments, price debt, and gauge inflation's drag on idle cash.










