The "Rule Of 72": 17 23 Progress: 75% The Rule of 72" lets you compare the Rate of Return on any potential investment. It's a great way for you to understand how much money you can make in a certain time on any investment. All you need to know is the Rate of Return you hope to make on your investment Quick refresher: don't forget that rate of return and ROI are the same thing If you have a savings account paying you a 2% rate of return. per year, your Return on Investment or ROI is also 2%. The Rule of 72: Divide the number 72 by your ROI. It's as simple as that! if you're making only 2% on an investment, divide 72 by 2 and you'll know how many years it will take to double your money: Need a calculator 72 divided by 2 - 36 years to double your money at 2% ROI now, you try it: How many years will it take you to double your money if: Round off your answers to one decimal place. years 1) Your ROI or rate of return is 4%? years 2) Your ROI is 10%? years. 3) Your ROI is 13%? Submit