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 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 Some of the answers are incorrect Have another look at the questions Here is a hint Divide the number 72 by your ROI Calculate 72 4 off to one decimal and 72 10 and 72 13 Don t forget to round place 1 Your ROI or rate of return is 4 10 0 0 years years