D Question 20 7.5 pts Refer to this table to answer the next 4 questions. The table represents the quantity produced, the total revenue, and the total cost of a firm operating in a perfectly competitive market. Quantity Total Revenue Total Cost O $0 $40 1 $100 $90 2 $200 $150 3 $300 $260 4 $400 $410 Profits are maximized when producing unit(s). 0 3 O 1 0 4 0 2 O 0 (zero)