How long will it take to double your investment? As experts are wont to caution, there are no guarantees in investing, but one useful formula can offer an approximation of what the future might hold. The “rule of 72” is a way to calculate how long it will take to double your money in an investment that offers a steady annual rate of return. This formula is an easy and quick way to estimate investment gains. Andrew Briggs, Director of Portfolio Management at The Briggs Groupoffers his explanation to the Wall Street Journal BuySide.

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