Answer
$8.5$ years
Work Step by Step
Solve the given formula for $ t.$
$ A=Pe^{rt}\quad $ ... $/\div P $
$(A/P)=e^{rt}\quad $ ... $/\ln(...)$
$\ln(A/P)=rt\quad $ ... $/\div r $
$ t=\displaystyle \frac{\ln(A/P)}{r}$
Insert the values given in the table.
$ t=\displaystyle \frac{\ln(25,000/17425)}{0.0425}\approx $8.4934 (round to 1 dec. place)