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13-7.  Klein Industries manufactures three types of portable air compressors: small, medium, and large, which have unit profits of $20.50, $34.00, and $42.00, respectively. The projected monthly sales are: 

                  Small  Medium  Large 
 Minimum  14,000   6,200  2,600 
 Maximum  21,000  12,500  4,200 

 The production process consists of three primary activities: bending and forming, welding, and painting. The amount of time in minutes needed to process each product in each department is shown below: 
                                 Small  Medium  Large  Available Time  
Bending/forming            0.4       0.7       0.8       23,400 
Welding                       0.6       1.0       1.2       23,400 
Painting                       1.4       2.6       3.1       46,800 
   
How many of each type of air compressor should the company produce to maximize profit? 
 a.  Formulate and solve a linear optimization model using the auxiliary variable cells method and write a short memo to the production manager explaining the sensitivity information. 
 b.  Solve the model without the auxiliary variables and explain the relationship between the reduced costs and the shadow prices found in part a. 
 
 
  
 
 
     
       
       
  ------- Slip Ring -------   
Number toModel 1Model 2Model 3   
    Make    0 0 0    
    Buy0 0 0    
       
Cost to      
    Make    $50 $83 $130 Total Cost  
    Buy$61 $97 $145 $0   
       
# Available0 0 0    
# Needed3,000 2,000 900    
       
Hours Required   UsedAvailable 
    Wiring2 1.5 3 0 10,000  
    Harnessing1 2 1 0 5,000  
       
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