Assume that the variable costs consist of food and paper, payroll and emplovee benefits, and 40% of the selling, general, and administrative expenses. a. What is McDooley's contribution maroin? \$ x b. What is MCDooley's contribution margin ratio? Round vour percentage answer to one decimal place. c. How much would operating income increase if the stores sales increased br $6,200 for the coming year, with no change in the contribution margit ratio or fined costs? d. What would have been the operating income or loss for the recent vear if sales had been 56,200 more