The Rule of 72: How to Gauge Growth SpeedA simple shortcut to measure the velocity of debt

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Smart Personal Finance Strategies

Compound interest often feels abstract until you map it to a timeline. By dividing 72 by your interest rate, you can instantly estimate how many years it takes for an investment or debt to double in value. This mental math tool transforms confusing percentage rates into concrete deadlines, helping you prioritize financial decisions without needing a calculator.