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Sam has quasilinear preferences and his demand function for x is D(p) = 15-p/3.The price of x is initially $15 per unit and increases to $24 per unit.Sam';s change is consumer surplus is the closest to:

Sam has quasilinear preferences and his demand function for x is D(p) = 15-p/3.The price of x is initially $15 per unit and increases to $24 per unit.Sam';s change is consumer surplus is the closest to:
A.-168
B.-76
C.-27
D.75
正确答案:-76