The cost structure of Dennis's Retail Mart is dominated by variable costs with a contribution margin ratio of 0.33 and fixed costs of $74,520. Every dollar of sales contributes 33 cents toward fixed costs and profit. The cost structure of a competitor, Oakfield Convenience Store, is dominated by fixed costs with a higher contribution margin ratio of 0.67 and fixed costs of $596,160. Every dollar of sales contributes 67 cents toward fixed costs and profit. Both companies have sales of $1,242,000 for the year. Required: a. Compare the two companies' cost structures. b. Suppose that both companies experience a 10 percent increase in sales volume. By how much would each company's profits increase? Complete this question by entering your answers in the tabs below. Required A Required B Compare the two companies' cost structures. Sales: Variable cost Contribution margin Fixed costs Operating profit Dennis's Retail Mart's Amount Percentage Oakfield Convenience Store Amount Percentage % % % % % % % % % % < Required B > Required A Required B Suppose that both companies experience a 10 percent increase in sales volume. By how much would each company's profits increase? Dennis's Retail Mart's profits increase by Oakfield Convenience Store's profits increase by