4. Smiling Cow Dairy can sell all the milk it wants for $4 a gallon, and it can rent all the robots it wants to milk the cows at a capital rental price of $100 a day. It faces the following production schedule: Number of Robots Total Product 0 gallons 50 85 OUT A W N H O 115 140 150 155 a. In what kind of market structure does the firm sell its output? How can you tell? b. In what kind of market structure does the firm rent robots? How can you tell? c. Calculate the marginal product and the value of the marginal product for each additional robot. d. How many robots should the firm rent? Explain