Problem 7.4. Joe Exotic from Problem 7.1 discovers that students can be easily identified by their college ID's, allowing him to segment the market for his exotic animal park. The graphs below show student demand and non-student ("other" ) demand for visits to the park. Marginal cost is $30 per visitor. Students Others P ($/visit) ($/visit) 100 100 90 90 20 10 MR. Demand MR Demand 0 1 2 3 4 5 6 7 8 9 Visitors 0 1 2 3 4 5 6 8 9 Visitors ( visits/hour) ( visits/hour) (a) Draw the marginal cost curve in each graph. Also in each graph, mark the point that determines the profit-maximizing quantity with the letter A. (b) Mark the price-discriminating equilibrium with two points. Use S to mark the price-quantity pair for students and O for others. (c) The park charges college students $ per visit and other people | $ per visit