Coast Cruiseline offers nightly dinner cruises off the coast of Nanaimo and Victoria. Dinner Cruise tickets sell for $80 per passenger. Coast Cruiseline's variable cost of providing the dinner is $40 per passenger, and the fixed cost of operating the vessels (depreciation, salaries, docking fees, and other expenses) is $220,000 per month. The company's relevant range extends to 15,000 monthly passengers Compute the number of dinner cruise tickets it must sell to break even a. Use the income statement equation approach b. Use the shortcut unit contribution margin approach; perform a numerical proof to ensure that your answer is correct. c. Use your answers from (a) and (b) to determine the sales revenue needed to break even. d. Use the shortcut contribution margin ratio approach to verify the sales revenue needed to break even