<PRE><B>Question 387483</B>
A student deposits $4,000 into a savings account with 7% continuously compounding interest. How many years does he to wait before the balance has tripled?
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A(t) = Pe^(rt)
3*4000 = 4000*e^(0.07t)
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e^(0.07t) = 3
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0.07t = ln3
t = 15.69 years
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Cheers,
Stan H.</PRE>