ueen Cruiseline offers nightly dinner cruises off the coast of Nanaimo and Victoria. Dinner cruise tickets sell for $80 per passenger. Queen 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 $200,000 per month. The company's relevant range extends to 15,000 monthly passengers. Use this information to compute the following: a) What is the contribution margin per passenger? b) What is the contribution margin? c) Use the unit contribution margin to project operating income if monthly sales total 14,000 passengers? d) Use the contribution margin ratio to project operating income if monthly sales revenue totals 600,000