3. Working with Numbers and Graphs Q4 The following graph shows the marginal cost (MC ) and average total cost (ATC ) and the initial demand (D1 ) curves of a perfectly competitive firm. Suppose this firm forms a cartel with other firms in the industry. Because of the cartel agreement, it has been assigned a production quota of 30 units. The cartel price is $70 per unit of output. You may use the purple rectangle (diamond symbols) to help you answer the questions that follow. You will not be graded on any changes you make to the graph.