13. A gas barbecue cost a retailer $420 less 33%, 22% and 5%. It carries a regular selling price at a markup of 62% of the regular selling price. During the end-of-season sale, the barbecue is marked down 45%. a. What is the end-of-season sale price? b. What rate of markup based on cost will be realized during the sale? c. If profit is set at 30% of the regular price what is the operating profit or loss at the sale price?