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Math Help - Rule of 72?

  1. #1
    Junior Member
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    Rule of 72?

    I have been trying to figure this out but I am stuck....

    Determine the time it takes to double an investment in an account that pays interest of 4% per annum compounded annually
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  2. #2
    MHF Contributor Unknown008's Avatar
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    You might want to read: Rule of 72 - Wikipedia, the free encyclopedia

    An estimate then becomes 72/4 = 18 years
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