A bicycle dealer has found that if 10-speed bicycles are sold for x dollars apiece and the price of gasoline is y cents per gallon, then approximately

bicycles will be sold each month. If the price of bicycles varies between $289 and $324 during a typical month, and the price of gasoline varies between $2.96 and $3.05, approximately how many bicycles will be sold each month on average?

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Q(x, y) = 200 - 24√x + 4(0.1y + 3)³/2