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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:
Perhaps the most tested way to double your money over a reasonable amount of time is too invest in a solid, non-speculative portfolio that's diversified between blue-chip stocks and investment grade bonds.While that portfolio won't double in a year, it almost surely will eventually, thanks to the old rule of 72.ut investors taking less risk by using bonds don't have to give up their dreams of one day proudly bragging about doubling their money. In fact, zero-coupon bonds (including classic U.S. savings bonds) can keep you in the double your money discussion. For the uninitiated, zero-coupon bonds may sound intimidating.