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How long, to the nearest year, will it take an investment to triple if it is continuously compounded at 18% per year?

I used A=Pe^rt to get the wrong answer 20 years. Don't understand what is wrong

  • Math -

    3P = Pe^.18t
    3 = e^.18t
    ln3 = .18t
    1.0986 = .18t
    t = 6.10

    This makes sense, considering the rule of 72, which states that at r%, the amount doubles about every 72/r years.
    So, we expect this to double every 4 years.

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