Answer
Duration will be $0.4\space y$ or $4.8\space months$.
Work Step by Step
This is a simple interest problem, so use the formula for simple interest.
$I = P\cdot r\cdot t$
$\therefore t = \frac{I}{P \cdot r}$
Identify what you know from the problem:
$P = \$125,$ $r = 0.175,$ and $I = \$8.75$
$\therefore t=\frac{8.75}{125\times 0.175}=0.4$ years.
Or
$0.4\space y= 0.4\times 12 \space months=4.8\space months$.
