Use the Information Given in the Table Below to Answer

Multiple Choice

Use the information given in the table below to answer the following question(s) . Assume the firm hires labor competitively and sells its product in a competitive price-taker market at a price of $2 per unit.
Table 12-7
Refer to Table 12-7. What is the marginal revenue product of the fifth unit of labor?

A) $2
B) $4
C) $20
D) $100