FunTime Cruiseline offers nightly dinner cruises departing from several cities on the East Coast of the United States including Charleston, Baltimore, and Alexandria. Dinner cruise tickets sell for $50 per passenger. FunTime Cruiseline's variable cost of providing the dinner is $30 per passenger, and the fixed cost of operating the vessels (depreciation, salaries, docking fees, and other expenses) is $210,000 per month. The company's relevant range extends to 20,000 monthly passengers. The breakeven units are 10,500 tickets sold. If FunTime Cruiseline sells 12,000 dinner cruises, compute the margin of safety a. in units (dinner cruise tickets). b. in sales dollars. c. as a percentage of sales. a. If FunTime Cruiseline selis 12,000 dinner cruises, compute the margin of safety in units (dinner cruise tickets). Begin by determining the formula, then compute the margin of safety in units (dinner cruise tickets)