FunTimeCruiseline 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.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.If FunTime 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 compute the target sales in units.