A farmer is growing corn on an acre of land. The output will be 200 bushels if one worker is hired, 500 if two, 700 if three, 850 if four, and 900 if five. The marginal product of the fourth worker is

A. 150 bushels.

B. 850 bushels.

C. 50 bushels.

D. 212.5 bushels.

In a Cournot setting, what should be the produced quantity and realized price in a duopoly with firms A and B that is characterized by P=140-Q and constant marginal costs of $20?

Fast-food restaurants like McDonald's are replacing cashiers with touchscreen ordering kiosks. Currently, the marginal product of another cashier is 48 customers served per hour. the marginal product of another kiosk is 32 customers served per hour. A cashier can be hired for a wage of $15; a kiosk rents for $12.

Price ($) 500 400 300 250 200 100 MC MR 5 10 15 20 25 30 35 40 45 50 55 60 Quantity