SOLUTION: The amount A in an account after t years of an initial principle P invested at an annual rate r compounded continuosly is given by A=Pe^rt where r is expressed as a decimal. Solve

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Question 82638This question is from textbook
: The amount A in an account after t years of an initial principle P invested at an annual rate r compounded continuosly is given by A=Pe^rt where r is expressed as a decimal. Solve this formula for t in terms of A,P and r. This question is from textbook

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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The amount A in an account after t years of an initial principle P invested at an annual rate r compounded continously is given by A=Pe^rt where r is expressed as a decimal. Solve this formula for t in terms of A,P and r.
:
P%2Ae%5Ert = A; Find t
:
Divide both sides by P and you have:
e%5Ert = A%2FP
:
Use the nat logs, and log equivalent of exponents:
rt * ln(e) = ln(A/P)
:
nat log of e = 1, so it's just:
r*t = ln(A/P)
:
Divide both sides by r:
t = %28ln%28A%2FP%29%29%2Fr
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