Minimize Z = 80X1 + 60X2 + 140X3
Subject to:
2X1 + 1X2 + 4X3 ≥ 1
2X1 + 2X2 + 2X4 ≥ 3/2
X1, X2, X3 ≥ 0
Solve using the 2-Phase method. Formulate the standard model and once the solution is defined, express your answer with the Z values and the variables.