(Break-even point and operating leverage) Rockstar, Inc. manufactures a complete line of men's and women's casual shoes for independent merchants. The average selling price of its finished product is $90 per pair. The variable cost for this same pair of shoes is $45. Footwear Inc incurs fixed costs of $160,000 per year. a. What is the break-even point in pairs of shoes sold for the company? b. What is the dollar sales volume the firm must achieve to reach the break-even point? c. What would be the firm's operating profit or loss (that is, net operating income) at the following units of production sold: 4,000 pairs of shoes? 9,000 pairs of shoes? 15,000 pairs of shoes? a. What is the break-even point in pairs of shoes sold for the company