Question 331898
F=Future value
r=annual interest rate
t= number of years
I=Initial investment
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The formula for continuously compounded value is 

{{{F=I*e^(rt)}}}
given F=9000, I=3000, r=4.3%, t=unknown

{{{9000=3000e^(0.043*t)}}} solve for t

ln(9000/3000)=0.043*t
ln(3)/0.043=t

can you finish this?