The output at a certain plant is Q(x, y) = 0.08x² +0.12xy + 0.3y² units per day, where a is the number of hours of skilled labor used and y is the number of hours of unskilled labor used. Currently, 80 hours of skilled labor and 200 hours of unskilled labor are used each day. Use calculus to estimate the change in output that will result if an additional hour of skilled labor is used each day, along with an additional hour of unskilled labor. a. 150 b. 120 C.I 80 d. 90 e. 166

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