Explanation:

There are sat least 2 ways of calculating this. You put everything together in one go or can split the process. I am going to split it.

$\textcolor{b l u e}{\text{Determine the deposit}}$

The deposit is: 25/200xx$139.00 =$34.75

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$\textcolor{b l u e}{\text{Determine the final payment}}$

$139.00 ul($color(white)(1)34.75) larr" subtract"

Write as:
$13cancel(9)^(8) .cancel(0)^(9)cancel(0)^(10) ul($color(white)(1)3color(white)(.)4color(white)(.). color(white)(.)7color(white)(..)5) larr" subtract"
$104color(white)(..).color(white)(.)2color(white)(..)5 Final payment is: $104.25
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$\textcolor{red}{\text{The other method}}$

Let the final payment be $x$

x=$139(100/100-25/100) x=$139(75/100)=\$104.25