Holvey Company makes three products in a single facility. These products have the following unit product costs The mixing machines are potentially the constrain in the production facility. A total of 6, 870 minutes are available per month on these machines. Direct labor is a variable cost in this company Required: a. How many minutes of mixing machine time would be required to satisfy demand for all three products? b. How much of each product should be produced to maximize net operating income? c. Up to how much should the company be willing to pay for one additional hour of mixing machine time if the company has made the best use to the existing mixing machine capacity