Question: lucy has the utility function u ( x , m ) = 1 0 0 x - x ^ 2 / 2 + m ,

lucy has the utility function u (x, m)=100x - x^2/2+m, where x is her consumption of earplugs and m is money left over to spend on other stuff. if she has$10,000 to spend on earplugs and other stuff and if the price of earplugs rises from$40 to $60, then her net consumer's surplus: A.falls by 800.
B. falls by 1,000.
C. falls by 1350.
D.increases by 400.

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