Springer Products manufactures the different product lines, Model X Model Yund Modelz Corsiden ble matet demands for al models. The following per unit dately Model X Modely Selling price $58 $81 Directa Direct labor ($12 per hour) 12 12 Variable support costs (54 per machine hour) 8 Food support cons 14 Which model has the greatest contribution margin per machine - hour? Model z 370 9 9 24 4 14 14 A. Model OB Model Y C. Model OD. Both Model X and Model Y have the highest and same contribution margin per machine-hour