Maximize
x1 + 2x2 - 0.1x3 -3x4
Subject To
x1 + x2 <= 5
2x1 - x2 >= 0
-x1 + 3x2 >= 0
x3 + x4 >= .5
Bounds
x3 >= 1.1
x3 <= 10
Semi-continuous
x3
End