Use the information from the Crystal Cruiseline Data Set. If Crystal Cruiseline sells an additional 600 tickets, by what amount will its operating income increase (or operating loss decrease)? 

Crystal Cruiseline Data

Crystal Cruiseline offers nightly dinner cruises off the coast of Miami, San Francisco, and Seattle. Dinner cruise tickets sell for $ 50 per passenger. Crystal 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 14,000 monthly passengers.