A compary produces two surfboard models: Mellow and Crush. Each model's selling price and variable costs follow. Machine hours per unit for Mellow is 8 hours and for Crush is 12 hours. The machine's capacity is 3,036 hours per year. ) For each model compute the contribution margin per machine hour. b) Assuming the company can sell up to 300 units of Mellow and 200 units of Crush por year, determine the best