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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:
Put simply, itâs how your investment grows over time. Letâs say you invest $10,000 in a three-year CD earning 5% annually. In the first year, your $10,000 investment will earn $500. In the second year, 5% of the new total ($10,500) will be $525. In the third year, 5% of $11,025 will be about $551. The total amount of money grows each year, so the amount representing 5% of your investment also grows. Thatâs compounding. Youâve decided a CD is an ideal investment for your cash.