8.1-6. The Onenote Co. produces single product at three plants for four customers. The three plants will produce 60, 80, and 40 units, respectively, during the next time period, The firm has made a commitment to sell 40 units to customer 1. 600 units to customer 2, and at least 20 units to customer 3. Both customers 3 and 4 also want to buy as many of the remaining units as possible. The net profit associated with shipping a unit from plant for sale to cus tomer j is given by the following table