Please help!

Excel Cruiseline offers rightly dinner cruises departing from several cities en the East Coast of the United States including Charleston, Baltimore, and Alexandris. Dinner eruise tickets sell for $60 per passenger. Excel Cruiseline's variable cost of providing the dinner is $30 per passenger, and the fored 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 monthly passengers. If Excel Cruiseline has a target operating income of $30,000 per month, how many dinner cruise tickets must the company sell? First, identify the formula, then compuse the target sales in units. 71]=Targetsalesunits