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Suppose you invest $100 at a compound interest rate of 10%. The rule of 72 tells you that your money will double every seven years, approximately: If you graph these points, you start to see the familiar compound interest curve:
Calculating the percentage change of your investment is quite easy. All it takes is a little bookkeeping and either a simple calculator or a pad of paper for doing the long division. Here is what you need to do: Take amount that you have gained on the investment and divide it by the amount invested.