DATA PROBLEM;                                                                   
* DATA IN THIS EXAMPLE COMES FROM P. 25-26  OF LEE , MOORE, AND TAYLOR ;           
INPUT X1 X2 X3 T $ R;                                                           
CARDS;                                                                          
3. 5. 2.   MAX .                                                                
5. 2. 4.  LE 240.                                                               
4. 6. 3.  LE. 400.                                                              
.0 .0  .0 LOWERBD .                                                             
;                                                                               
PROC LP DATA=PROBLEM;                                                           
VAR X1-X3;                                                                      
RHS R;                                                                          
TYPE T;