You operate a car detailing business with a fixed amount of machinery (capital), but you have recently altered the numbe

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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 5 cars per person in each hour, and five employees can generate an average product of 4 cars per person in each hour. What is the marginal product of labour as you increase the labour from three to five employees?
a.
MP = 2.5 cars
b.
MP = 1.5 cars
c.
MP = 3 cars
d.
MP = -1 cars