Answer: For the 10th worker, the marginal revenue product is $120 per day.
Explanation:
Here in this case by hiring the [tex]10^{th}[/tex] worker, the store is able to make 30 more units .
Given:
The store earns $4 for each pound of produce that it sells.
Thus the marginal revenue product of the 10th worker = 30×$4 = $120