You have a part time job. you work for 3 hours on friday and 6 hours on saturday. you also receive an allowance of $20 per week. you earn $92 per week. how much do you earn per hour at your part time job?

$92 - $20 = $72, because we shouldn't take allowance into account
3 + 6 = 9, because that is the total number of hours this person works per week
We should just do this:
72 / 9 = 8
This means that this person earns $8 per hour at his part time job.