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? (1) Use the objective function method. (2) Use the enumeration method.

Solve as an LP model. Solve the model using the solver in Excel.