assembly department has a monthly capacity of only 1400 units. Currently Shelby is producing and selling 400 units of model S and 1400 units of model LX per month. Model S shelves are sold for $1800, and model LX shelves are sold for $2100. Shelby's operation is fairly small in the industry, and management at Shelby believes it cannot raise prices beyond these levels because of the competition. However, the marketing department believes that Shelby can sell as much as it can produce at these prices. The costs of production are summarized in the Accounting Data sheet. As usual, values in blue cells are given, whereas other values are calculated from these. Management at Shelby just met to discuss next month's operating plan. Your job is to develop an LP model of Shelby's problem, then run Solver, and finally make a recommendation to Shelby management