Did you provide the all information? Because all you can do with the given information is to plug P=4 into the equation and find x, but x is quantity of CD demanded.
Consumer surplus is the difference between the max price a consumer willing to pay and the actual price they do pay.
So you do have the actual price they pay - $4, and you can find how many thousand of CDs is being sold, but you need to have (I believe) extra information, such as price consumers willing to pay.
The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand.
P=-0.01X^2-0.1X+6
Determine the consumers' surplus if the wholesale market price is set at $4/disc. (Round your answer to two decimal places.)
$ ?
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