please help with all parts!

The company estimates that it can sell 850 units of each product per month. The same raw material is used in each product. The material costs $3 per pound with a maximum of 5,700 pounds available each month. Required: 1. Calculate the contribution margin per pound of the constraining resource for each product. 2. Which orders would you advise the company to accept first, those for A, B, or C? Which orders second? Third? 3. What is the maximum contribution margin that the company can eam per month if it makes optimal use of its 5,700 pounds of materials