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

The demand for a certain commodity is

D(x) = 4000e.09x

units per month when the market price isxdollars per unit.

(a)At what rate is the consumer expenditureE(x) =xD(x) changing with respect to pricexwhen 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 therateof consumer expenditure begin to increase?

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