85. Marginal demand. At a price of x dollars, the demand, in thousands of units, for a certain turntable is given by the demand function 9= 240e-0.003x a) How many turntables will be bought at a price of $250? Round to the nearest thousand. b) Graph the demand function for 0 sxs 400. c) Find the marginal demand, q'(x). d) Interpret the meaning of the derivative.

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