2. A firm's product sells for $4 per unit in a highly competitive market. The firm produces output capital (which it rents at $25 per hour) and labor (which is paid a wage of $30 per hour under a contract for 20 hours of labor services). Complete the following table and use that information to answer these questions. a. Identify the fixed and variable inputs. b. What the firm's fixed costs? c. What is the variable cost of producing 475 units of output? d. How many units of the variable input should be used to maximize profits? e. What are the maximum profits this firm can earn? f. Over what range of the available input usage do increasing marginal returns exist? g. Over what range of the available input usage do decreasing marginal returns exist? h. Over what range of input usage do negative marginal returns exist? K L Q MPk APK APL VMPK 0 20 0 1 20 50 2 20 150 3 20 300 4 20 400 5 20 450 6 20 475 7 20 475 8 20 450 9 20 400 10 20 300 11 20 150