** Linear Programming **
Max Z = 6x1 + 10x2+9x3 + 20x4
constraint
4x1 + 9x2 + 7x3 + 10x4
= 600
x1 + x2+3x3 + 40x4=
400
3x1 + 4x2 + 2x3 + x4 =
500
x1,x2,x3 ,x4 ≥ 0
Find the allowable decrease and increase for x4.
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