Company makes two products in a single facility. These products have costs: Additional data concerning these products are listed below. The mixing machines are potentially the constraint in the production facility. A total of 18,000 minutes are available per month on these machines. Up to how much should the company be willing to pay for sixty minutes (one hour) of additional mixing machine time if the company has made the best use of the existing mixing machines capacity? (Round off to the nearest whole dollar.) A $570 B. $450 C. $611 D. $485 E. None of the above