Barlow Company manufactures three products-A, B, and C. The selling price, variable costs, and contribution margin for one unit of each product follow: Product A B C Selling price $ 180 $ 300 $ 240 Variable expenses: Direct 18 90 27 materials Other variable 126 120 177 expenses Total variable 144 210 expenses Contribution margin Contribution S 36 S $ 90 S 204 36 margin ratio 20 % 30 % 15 % Calculate the contribution margin per pound of the constraining resource for each product. 2. Assuming that Barlow has unlimited demand for each of its three products, what is the maximum contribution margin the company can earn when using the 6,300 pounds of raw material on hand? 3. Assuming that Barlow's estimated customer demand is 600 units per product line, what is the maximum contribution margin the company can earn when using the 6,300 pounds of raw material on hand? 4. A foreign supplier could furnish Barlow with additional stocks of the raw material at a substantial premium over the usual price. Assuming Barlow's estimated customer demand is 600 units per product line and that the company has used its 6,300 pounds of raw material in an optimal fashion, what is the highest price Barlow Company should be willing to pay for an additional pound of materials?