A bicycle dealer has found that if 10-speed bicycles are sold for x dollars each and the price of gasoline is y cents per gallon, approximately F(x, y) bicycles will be sold each month, where

Currently, the bicycles sell for $324 apiece and gasoline sells for $3.80 per gallon. Use marginal analysis to estimate the change in the demand for bicycles that results when the price of bicycles is kept fixed but the price of gasoline decreases by 1 cent per gallon.

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F(x, y) = 200-24√x + 4(0.1y + 3)³/2