Scenario: Suppose That Professors Pay Their Teaching Assistants $10 an Hour

Scenario: Suppose that professors pay their teaching assistants $10 an hour to grade papers for their classes, and then the professors sell the graded papers back to the students in their classes for $.75 a paper. The following table shows the number of papers graded in a given number of hours.

-Refer to the scenario above.What is the value of the marginal productivity of labor of the fifth hour of labor?

A) $5.25
B) $9.00
C) $10.50
D) $15.50