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Math Help - Compounding Interest Continuously

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    Exclamation Compounding Interest Continuously

    Susan invested $5000.00 at 10% compounded semiannually. In how many years will susan's investment have tripled? Round your answers to the nearest tenth.
    Last edited by mr fantastic; April 2nd 2009 at 03:37 AM. Reason: Removed the shouting
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    Quote Originally Posted by fran_eric_07 View Post
    Susan invested $5000.00 at 10% compounded semiannually. In how many years will susan's investment have tripled? Round your answers to the nearest tenth.
    Is it 10% per annum? I will assume so.

    A = 5000 \left( 1 + \frac{5}{100}\right)^n where n is the number of half years.

    So solve 15000 = 5000 \left( 1 + \frac{5}{100}\right)^n for n.
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