Feather Friends, Inc., distributes a high-quality wooden birdhouse that sells for $120 per unit. Variable expenses are $60.00 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 $3,240,000 1,620,000 1,620,000 180,000 $1,440,000 Net operating income