Question

Joe's demand for spring water can be represented as p = 10 Q (where p is...

Joe's demand for spring water can be represented as p = 10 Q (where p is measured in $/gallon and Q is measured in gallons). He recently discovered a spring where water can be obtained free of charge. His consumer surplus from this water is −

A. $0.

B. $100.

C. $50.

D. unknown based upon the information provided.

i know the correct answer is C, but why?

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