Spacet Excavating Company experienced the following costs in 2010:

Direct materials $1.75 / unit Direct labor $2.00 / unit Variable manufacturing overhead $2.50 / unit Variable selling $.75 / unit Fixed manufacturing overhead $50,000 Fixed selling $15,000 Fixed administrative $5,000

During the year the company manufactured 100,000 units and sold 80,000 units. If the average selling price per unit was $22.65 what is the company's contribution margin per unit?

$16.40

$15.65

$18.90

$13.65