a. An appliance manufacturer produces two models of microwave ovens: Hand W. Both models require fabrication and assembly work; each Huses four hours of fabrication and two hours of assembly, and each Wuses two hours of fabrication and six hours of assembly. There are 600 fabrication hours available this week and 480 hours of assembly. Each H contributes $40 to profits, and each W contributes $30 to profits. What quantities of Hand Wwill maximize profit? Use either the objective function or enumeration method. H W Z b. The company also produces two refrigerator models: large (L) and medium (M). Although materials to produce the refrigerators is available, fabrication time and assembly time are limited. There are 540 hours available for fabrication and 600 hours available for assembly this week. Each unit of model L requires 6 hours for fabrication and 3 hours for assembly, and each unit of M requires 4 hours for fabrication and 5 hours for assembly. Each unit of L contributes $50 to profit, and each unit of model M contributes $40 to profit. How many units of each model should be produced if the objective is to maximize profit? (Round "L" to 2 decimal places.) Use either the objective function or enumeration method. L M N