SOLUTION: "Stephanie deposited some money in a bank account that earns 5.6% interest compounded continuously. How long will it take to double the amount of money in her account?" So far I

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Question 588675: "Stephanie deposited some money in a bank account that earns 5.6% interest compounded continuously. How long will it take to double the amount of money in her account?"
So far I used the PERT formula to set up the problem, but without a principal amount I am lost as to how I can give an exact amount of time!
I have:
A(t)=Pe^0.56t

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
What it is saying is that she starts with +P+
and ends up with +2P+ in her account, so
I can say
+2P+=+P%2Ae%5E%28.056t%29+
Divide both sides by +P+
+e%5E%28.056t%29+=+2+
+.056t+=+ln%28+2+%29+
+t+=+ln%282%29+%2F+.056+
You'll have to calculate this.
All I have is a staples calculator