Feather Friends, Incorporated, distributes a high-quality wooden birdhouse that sells for $80 per unit. Variable expenses are $40.00 per unit, and fixed expenses total $180,000 per year. Its operating results for last year were as follows: Sales Variable expenses Contribution margin Fixed expenses Net operating income $ 2,080,000 1,040,000 1,040,000 180,000 $ 860,000