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December 13th, 2013, 04:17 PM   #1
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consumer/ supply surplus!

My professor reopened the homeoworks for my class which i can get a B if i do all of them! here's one that's giving me problems.

The demand function for a certain make of replacement cartridges for a water purifier is given by the following equation where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand.

P=-.01x^2-.1x+4

Determine the consumers' surplus if the market price is set at $2/cartridge. (Round your answer to two decimal places.)

how do i do this? he closes them at 11pm tonight so there isn't much time!
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