(LO 3-2) 3-34. Analysis of Cost Structure The Greenback Store's cost structure is dominated by variable costs with a contribution margin ratio of .25 and fixed costs of $40,000. Every dollar of sales contributes 25 cents toward fixed costs and profit. The cost structure of a competitor, One- Mart, is dominated by fixed costs with a higher contribution margin ratio of .75 and fixed costs of $440,000. Every dollar of sales contributes 75 cents toward fixed costs and profit. Both companies have sales of $800,000 for the month. Required a. Compare the two companies' cost structures using the format shown in Exhibit 3.5. b. Suppose that both companies experience a 15 percent increase in sales volume. By how much would each company's profits increase