Suppose the labor cost in dollars for manufacturing a cabinet is C where x is the number of hours required by a master crafts person and y is the number of hours required by an apprentice. Find the number of hours required by an apprentice to minimize labor costs. C (x, y) = x² + y² – 4x – 8y – 2xy + 155 %3D 155 67 O 12 O 16

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