To solve this equation, all you need to do is plug in the amount of hours the repairman works for x.
So, when the repairman works for 5 hours, 40.50x=40.50(5).
When you multiply 40.50*5, you get 202.5.
When you convert this back to dollars and cents, your final answer is $202.50.
If the repairman works for 5 hours, then he will earn/charge $202.50.