The demand for a certain commodity is -05x D(x) = 6000e %3D units per month when the market price is r dollars per unit. (a) At what rate is the consumer expenditure E(x) = xD(x) changing with respect to price x when the price is equal to $110 dollars? %3D (b) At what price does consumer expenditure stop increasing and begin to decrease? (c) At what price does the rate of consumer expenditure begin to increase?

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