CONSUMER EXPENDITURE The demand for a particular commodity is given by D(x)= −35x+200; that is, x units will be sold (demanded) at a price of p = D (x) dollars per unit.
a. Consumer expenditure E(x) is the total amount of money consumers pay to buy xunits. Express consumer expenditure E as a function of x.
b. Find the average change in consumer expenditure as x changes from x = 4 to x =5.
c. Use calculus to find the instantaneous rate of change of expenditure with respect to xwhen x = 4. Is expenditure increasing or decreasing when x = 4?
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