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7 August, 21:13

You have $50,000 in savings for retirement in an investment earning a stated annual rate of 11% compounded monthly. You aspire to have $1,000,000 in savings when you retire. Assuming you add no more to your savings, how many years will it take to reach your goal?

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  1. 7 August, 21:38
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    2,39 years

    Explanation:

    Compound interest formula:

    Final Capital (FC) = Initial Capital (IC) (1 + interest (i)) ^ (number of periods) (n)

    The problem is giving us:

    FC = $1,000,000

    IC = $50,000

    i = 11% (periodic rate: monthly)

    And we want to find n. Because the interest rate is given in months we will first find n in number of months. Then, we will get the number of years.

    If we transform the formula in terms of FC, FI and i, we get:

    n = [ln (FC/IC) ]/[ln (1+i) ]

    n=ln (20) / ln (1.11)

    n=28,706 months

    We divide 28,706 into 12 (12 months in a year), we get 2,39 years.
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