ANSWER
Find out the how much money did you make.
To proof
Let us assume that the money makes = x
As given
you earn 13% commission in addition to $5.25 per hour.
you work for 7.75 h and sell $95.20 worth of merchandise.
13 % is written in the decimal form

= 0.13
13 % on the worth of merchandise = 0.13× 95.20
= $12.376
than the equation becomes
x = 12.376 + 5.25 × 7.75
x = 12.376 + 40.6875
x = 53.0635
x = $53.1 ( approx)
money did you make was $53.1 ( approx).
Hence proved