Flow Cruiseline offers nightly dinner cruises departing from several cities on the eastern coast of the United States including Charleston, Baltimore, and Alexandria. Dinner cruise tickets sell for $50 per passenger. Flow 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 $210,000 per month. The company's relevant range extends to 15,000 monthly passengers. Compute the number of dinner cruise tickets Flow Cruiseline must sell to breakeven and the sales dollars needed to breakeven. Compute the number of dinner cruise tickets Flow Cruiseline must sell to breakeven. Use the shortcut unit contribution margin approach. First, identify the formula, then compute the breakeven sales in units. (Complete all input fields. For amounts with a $0 balance, make sure to enter "O" in the appropriate input field.) ( + = Breakeven units +