Multiple-Product Profitability Analysis. Multiple-Level Profitability Analysis College Avenue Bookstore sells new college textbooks at the publishers- suggested retail prices. It then pays the publishers an amount equal to 75 percent of the suggested retail price. The store's other variable costs average 5 percent of sales revenue and annual fixed costs amount to $360,000. For a project with predicted sales of 8,000 new books at $120 each. determine. The bookstores' contribution. The publisher's contribution. The author's royalties