Help, please. I have test

Problem 9 (10 points) Answer the following questions using the information below: Braun's Rraleem uns 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: Model X Model Y Model Z $50 $60 $70 Selling price Direct materials Direct labor ($12 per hour) Variable support costs (54 per machine-hour) Fixed support costs 12 24 4 10 10 10 Which model has the greatest contribution margin per unit? Which model has the greatest contribution margin per machine-hour? If there is excess capacity, which model is the most profitable to produce? If there is a machine breakdown, which model is the most profitable to produce