I’m so so sorry but i really need to answer a question
He has 2 jobs paying different rates.
At $15/hr for 8 hours, he earns $120.
At $18/hr for 4 hours, he earns $72.
Summing these up: $120 + $72 = $192
Dividing by the total # of hours worked (12),
$192
--------- = $16/hr (average rate)
12 hr