What if A firm can produce 450 gallons of milk per day with 4 workers and 500 gallons per day with 5 workers The marginal product of the fifth worker expressed in gallons per worker per day is?

The marginal product of the fifth worker is calculated by finding the difference in output when adding that worker. With 4 workers, the firm produces 450 gallons, and with 5 workers, it produces 500 gallons. Therefore, the marginal product of the fifth worker is 500 gallons - 450 gallons = 50 gallons. Thus, the marginal product of the fifth worker is 50 gallons per worker per day.