Contribution Margin and Contribution Margin Ratio For a recent year, McDooley's, a family-owned group of restaurants, had the following sales and expenses: Sales for all restaurants $320,000 Food and paper $117,020 Payroll and employee benefits 76,500 Occupancy and other expenses 37,480 Selling, general, and administrative expenses 44,200 Other operating expenses 19,200 Net operating expenses (294,400) Operating income (loss) $25,600 Assume that the variable costs consist of food and paper, payroll and employee benefits, and 40% of the selling, general, and administrative expenses. a. What is McDooley's contribution margin? b. What is McDooley's contribution margin ratio? Round your percentage answer to one decimal place. % c. How much would operating income increase if the stores sales increased by $6,400 for the coming year, with no change in the contribution margin ratio or fixed costs? $ d. What would have been the operating income or loss for the recent year if sales had been $6,400 more