Fixed costs are applied to the products on the basis of direct labor hours. Demand for the three products exceeds the company's productive capacity. The milling machine is the constraint, with only 2,600 minutes of milling machine time available this week. Required: a. Given the milling machine constraint, which product should be emphasized? b. Assuming that there is still unfilled demand for the product that the company should emphasize in part (a) above, up to how much should the company be willing to pay for an additional hour of milling machine time