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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:
If you get twice interest during a year , then it is per annum compounding interest. In per annum interest rate you will get specific rate of interest in a year for your investment. For example:-. You have fixed deposit of $10,000 and you will get 15%interest per annum for 10 years. Time=10 years.