At what price does the rate of consumer expenditure begin


The demand for a certain commodity is D(x) = 4000e-.09x units per month when the market price is x 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 $120 dollars?

(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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Mathematics: At what price does the rate of consumer expenditure begin
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