need help on reuqired 1 and 3

Outdoor Luggage, Incorporated, makes high-end hard-sided luggage for sports equipment. Data concerning three of the company's most popular models appear below. Si Guard Golf Guard Fishing Guard Selling price per unit $ 250 $ 250 $ 255 Variable cost per unit $ 160 $ 140 $ 155 Plastic injection molding machine processing time required to produce one unit 12 minutes 6 minutes 5 minutes Pounds of plastic pellets per unit 7 pounds 10 pounds 6 pounds Required: 1. If we assume that the total time available on the plastic Injection molding machine is the constraint in the production process, how much contribution margin per minute of the constrained resource is earned by each product? 2. Which product offers the most profitable use of the plastic Injection molding machine? 3. If we assume that a severe shortage of plastic pellets has required the company to cut back its production so much that its new constraint has become the total available pounds of plastic pellets, how much contribution margin per pound of the constrained resource is earned by each product? 4. Which product offers the most profitable use of the plastic pellets? 5. Which product has the largest contribution margin per unit