Question 6 Braun's Brakes manufactures three different product lines, Model X, Model Y, and Model Z. Considerable market demand exists for all models. The following per unit data apply: Selling price direct materials direct labor Model X Model Y Model Z 65 60 70 4 6 6 12 12 12 12 ($12/labor hour) 24 24 variable support costs 4 8 8 ($4/ machine hour) fixed support costs 10 10 10 15 pts What is the contribution margin per machine hour of the product that should be produced when there is a limited number of machine hours available?