Marigold sells books, movies, and magazines to a wide customer base. In a typical month, about 40% of its sales volume is from books, 40% from movies, and 20% from magazines. The selling price and cost information for each of these product categories is as follows. Selling price Variable cost/unit Books (a) $11 3 Movies $16 9 Magazines $5 1 In addition, Marigold incurs facility and administrative costs that average $34,000 per month. Find the weighted-average contribution margin per unit for this company. (Round answer to 2 decimal places, e.g. 15.25.) SUPPORT