SOLUTION: How long will it take a sum of money to treble if it is invested at 15% interest compounded semi-annually?

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Question 944469: How long will it take a sum of money to treble if it is invested at 15% interest compounded semi-annually?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
3P=P%281%2B0.15%2F%282%2A100%29%29%5EN
3=1.075%5EN
N=log%28%283%29%29%2Flog%28%281.075%29%29
N=15.2 6 month-periods