Bay Cruiseline offers nightly dinner cruises off the coast of Miami, San Fransisco and Seattle. Dinner cruise tickers sell for $50 per passenger. Bay Cruiseline's variable cost of providing the dinner is $20 per passenger, 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.

If Bay Cruiseline sells an additional 500 tickets, by what amount will it's operating income increase (or operating loss decrease)?