Suppose that the labor cost for a building is approximated by C x y 10x 2y 80x 420y 18 000 where x is the number of days of

Question

Suppose that the labor cost for a building is approximated by C x y 10x 2y 80x 420y 18 000 where x is the number of days of skilled labor and y is the number of days of semiskilled labor required Find the x and y that minimize cost C x 4 y 105 x 105 y 42 x 42 y 315 Ox 8 y 210

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