Touchmark Corp produces three products, with costs and selling prices as follows: Selling price per unit . Variable costs per unit. Contribution margin per unit... Product A Product B Product C $60 100% $20 100% $30 100% 45 75% 10 50% 12 40% $15 25% $ 10 50% $ 18 60% A particular machine is a bottleneck. On that machine, 7.5 machine hours are required to produce each unit of Product A, 2 hour is required to produce each unit of Product B, and 6 hours are required to produce each unit of Product C. In which order should it produce its products