Live It 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 $$60$ per passenger. Live It

Cruiseline's variable cost of providing the dinner is $$30$ per passenger, and the fixed cost of operating the vessels $($depreciation$,$ salaries, docking fees, and other expenses$)$ is $$270,000$ per month. The company's relevant range

extends to $18,000$ monthly passengers. The breakeven units are $9,000$ tickets sold. If Live It Cruiseline sells $10,000$ 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 Live It Cruiseline sells $10,000$ 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$).$