12. Suppose that Avatar and Pandora are two companies that supply water for Gotham city. Assume that the marginal cost of bottling water is a constant G$4 per bottle, and the demand for water is shown in the following schedule. Price (G$) Quantity (unit) 9 100 200 7 300 6 400 500 600 700 2 800 If Avatar and Pandora form a cartel, what would the price and quantity be? a. G$4: 600. b. G$5: 500. c. G$6: 400. d. G$7: 300