The answer is C.
Because you dont want to deal with all the overtime money and hours, you need to subtract her total amount ($422.75) from her overtime money ($42.75).
$422.75-$42.75=$380
So that means that her job paid her $380 total for the 40 hours. (NOT including her overtime, because we subtracted it.
Because you want to know how much she makes per hour, you need to divide her total amount of money ($380, which is NOT including the overtime amount) by her hours ($40)
$380/40 hrs is $9.50/1 hr.
so you have $9.50 an hour. :)