6 6 6 following per unit data apply. Dynondo's Brakes manufactures three different product lines, Model X, Model Y, and Model Z. Considerable market demand exists for all models. The Model X Model Y Model z Selling price $57 $67 $74 Direct materials Direct labor ($14 per hour) 14 14 28 Vartable support costs (4 per machine-hour) 4 Fixed support costs 13 13 13 If there is excess capacity, which model is the most profitable to produce? Model X Model Y Model z Both Model X and Modely have same and highest profitability 8 9