SOLUTION: The question is: How long will it take P dollars to double itself at 9% simple interest? --I know the formula is i=prt, I'm just not sure how to solve this equation without th

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Question 136123: The question is:
How long will it take P dollars to double itself at 9% simple interest?
--I know the formula is i=prt, I'm just not sure how to solve this equation without the Principal amount. Thanks so much

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
the formula is: i=p(1+r)^t
2p=p(1+.09)^t
2p/p=(1.09)t
2=(1.09)^t
2=(1.09)^8.04324 (8 years & 16 days).
2=2.000001