Minimize Z = 200x| + 160x2 (cost, $) subject to 6x1 + 2x2 2 12 (high-grade ore, tons) 2x1 + 2x2 2 8 (medium-grade ore, tons) 4x1 + 12x2 2 24 (low-grade ore, tons) X1, X2 2 ()

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