7/16
Step-by-step explanation:
There are 7 parts shaded out of 16.
I believe it would be $12*$8(x hours)=Β
Because you have to pay them $12 no matter what but the number of hours you use depends on how much more you have to give them
So for example I only wanted to go for 5 hours that means
I pay him $12*$8(5)=$52
You can also set your equation up like that too.