High-low method for a service company Sierra Railroad Inc. decided to use the high-low method and operating dota from the past six months to estimate the fixed and variable components of tanapartation ccst5. The activity base used by Sierro Railroad is "gross -ton miles," which is the total number of tons multiplied by the miles moved: Determine the variable cost per gross-ton mile and the total fous cost. Variabie cost (If required, round to two decimal places.) I per grossiton mile Total fixed cost 5 Contribution margin and conkribution inargin ratio For a recient year, McDonald's (MCD) company-owned restaurants had the following sales and expenses (in millions): Assume that the variable costs consist of food and paper, payroll, 25%6 of oceupancy and other expenses, and 40% of the general, selling, and adrinistrative expense a. What is McDonald's contribution margin? milion b. What is McDonald's contribution margin ratio? Round to one decimal place. c. How much would operating income increase if same-store sales increased by $800 million for the coming yeac, with no change in the contribution margin ratia ar f costs? Round your answer to the nearest tenth of a million (one decimal place). milion