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Great Cruiseline cfers nightly dinner cuises departing from several cibes on the East Coast of the United States including Charleston, Baltimore, and Alexandria. Dinner cruise bickets sel for $50 per passenger, Great Cruiseline's variable cost of providing the dinner is $20 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 15,000 monthily passengers. Compute the number of dinner cruise tickets Great Cruiseline must sell to breakeven and the sales dolars needed to breakeven. Compute the number of dinner cruise tickets Great Cruiseline must sell to breakeven. Use the shortcut unit contribution margin approach. Frst, identify the formula, then compute the breakeven sales in units. (Complete at input feids. For amounts with a so balance, make sure to ener "Fr in the appropriate input field.)