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 $ 1,242,000 832,140 409,860 74,520 335,340 $ Dennis's Retail Mart's Amount $ Percentage 100 % 67 % 33 % % % Oakfield Convenience Store Amount $1,242,000 $ 409,860 832,140 596,160 Percentage 100 % 33 % 67 % % %