Group price discrimination (also called third-degree price discrimination) is the most common type of price discrimination. Under it, a firm charges each group of customers a different price, but it does not charge different prices within the group. If the two countries were instead two different groups of customers, resale could be prevented, and average cost was also constant at 10 , what would be the monopolist's total profits? Would the monopolist ever incur a loss in selling to one of its groups of customers? Explain.