!Keywords: Forecasting / Marketing / Product Management / Production / Scheduling;
MIN    800 I1 + 800 I2 + 800 I3 + 500 U1
     + 500 U2 + 500 U3 + 500 U4 + 500 D1 
     + 500 D2 + 500 D3 + 500 D4 + 500 U5 
     + 500 D5
SUBJECT TO
   2)  -  I1 + P1 =    20
   3)     I1 - I2 +  P2 =     30
   4)     I2 - I3 +  P3 =     50
   5)     I3 + P4 =    60
   6)     U1 - D1 -  P1 =   - 55
   7)     U2 - D2 +  P1 -   P2 =    0
   8)     U3 - D3 +  P2 -   P3 =    0
   9)     U4 - D4 +  P3 -   P4 =    0
  10)     U5 - D5 +  P4 =     55
END