empire airlines reports the following cost data for the year. the company flew 100 private flights during the year. a group has offered empire $11,000 for a private flight to chicago for its members. revenue $ 20,000 per flight wages, salaries, and benefits $ 7,000 per flight fuel and oil $ 4,500 per flight food and beverages $ 500 per flight depreciation $ 300,000 per year rent $ 250,000 per year (a) what is the contribution margin from accepting the offer? (negative amounts should be indicated with a minus sign.) (b) should the offer be accepted or rejected?