420. Use simplex method to
Maximize z = 4x1 + 3x2 + 4x3 + 6x4 subject to the constraints :
x1 + 2x2 + 2x3 + 4x4 s 80, 2xy + 2x3 + x4 S 60
3x, + 3x2 + x3 + x4 S 80, X1, X2, X3, X4 S 0.
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