You Operate a Car Detailing Business with a Fixed Amount

Multiple Choice

You operate a car detailing business with a fixed amount of machinery (capital) , but you have recently altered the number of workers that you employ per hour. Three employees can generate an average product of 4 cars per person in each hour, and five employees can generate an average product of 3 cars per person in each hour. What is the marginal product of labor as you increase the labor from three to five employees?

A) MP = 3 cars
B) MP = 1.5 cars
C) MP = 15 cars
D) MP = -1 cars