3. assuming that barlow’s estimated customer demand is 500 units per product line, what is the maximum contribution margin the company can earn when using the 6,600 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 500 units per product line and that the company has used its 6,600 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?