Live it Cruiseline offers nightly dinner cruises departing from several cities on the eastern coast of the United States including Chateston, Baltimore, and Alexandia. Dinnel cruise tickets sell for $60 per passenger. Live it Cruiseline's variable cost of provding the dinner is $30 per passenger, and the Fxed cost of operating the ve9sels (depreciation, salaries, docking fees, and other expenses) is $270,000 per month. The company's relevitht range extends to 19,000 monthly passengers. If Lwe lt Cruiseline sclis an add tional 500 tickets, by what amount will its operating income increase (or operating loss decrease)