Answer: A.) $18.00
Step-by-step explanation:
Marginal benefit is the amount by that the total benefit increases with each extra hour of work.
Given : The wage rate for each of the first forty hours will continue to be the usual $15 per hour.
The employer has asked you to start working overtime and has offered to pay $18 per hour for every hour you work beyond forty hours a week.
Here , Total earning = $15 x (first 40 hours)+ $18 (Each additional hours)
Here , the total earning is increasing by each additional hour of working after first 40 hours.
Therefore , the marginal benefit of working each hour of overtime is $18.00.
Hence, the correct answer is A.) $18.00