2.75(x)+114=320.25
-114 -114
2.75(x)=206.25
/2.75. /2.75
X=75
It costs 75$ per hour
This is because we don’t know how much they charge per hour but we know the number of hours spend working on the computer, so you have to do 2.75(x) where x represents the cost per hour And we also know that the cost of the part is $114 so we have to add that to
(2.75(x)+114) the equation then finally you have to make the expression equal to 320.25 since we know the final cost so
2.75(x)+114=320.25