4. Harry, Ron and Hermione are the only students selling Gryffindor badges at Hogwarts. They are arguing over how much to sell and what prices to charge. Ron wants to make the most money, while Hermione want to sell as many badges as possible without losing any money. Harry wants to book the highest number of sales. They approach you to resolve their dilemma. Show the possible P-Q suggestions you would make to satisfy each of these three scenarios on a single diagram depicting their demand and cost curve (s).