Jayleen Company makes two products: Carpet Kleen and Floor Deodorizer. Operating information from the previous year follows. Units produced and sold Machine hours used Sales price per unit Variable cost per unit Carpet Kleen 7,000 7,000 $ 9 $ 6 Floor Deodorizer 6,000 3,000 $ 12 $ 10 Fixed costs of $30,000 per year are presently allocated equally between both products. If the product mix were to change, total fixed costs would remain the same. The contribution margin per machine hour for Floor Deodorizer is