Answer
7 years
Work Step by Step
Insert $A=3(2350)=7050$,
the given $P$ and $r$ into the formula and solve for t.
$7050=2350e^{0.157t}\qquad.../\div 2350$
$3=e^{0.157t}\qquad .../$apply ln() to both sides..
$\ln 3=0.157t\qquad.../\div 0.157$
$ t=\displaystyle \frac{\ln 3}{0.157}\approx$6.99753050107$\approx$7 years
