Answer: C. 6 hours
Step-by-step explanation:
Roy worked for 2 hours and earned $12.
First you want to know how much money he made in one hour. So you divide 12 by 2.
12 ÷ 2 = $6 per hour
Now you wanna know how many hours must he work at the same rate to earn $36.
$6 × 6hours = 36
So the answer is C. 6 hours