21. Stuffies, Inc. manufactures stuffed animals, all of which must be stuffed on the company's one stuffing machine. The machine operates 40 hours per week. The following table pres. ents the weekly demand, sales price, direct materials cost, and stuffing time for each of the three sizes of stuffed animals manufactured at Stuffies. LARGE SMALL 120 500 $15 $100 MEDIUM 200 $30 15 5 minutes Weekly demand Sales price Direct materials cost Stuffing time 20 5 8 minutes 2 minutes Determine the optimum product mix