AR (= P = Demand curve) = TR/Q = 100 - 2Q, so dQ/dP = 1/(dP/dQ) = - 1/2
MR = 100 - 4Q = 40, so Q = 15
While Q = 15, P must be 100 - 2*15 = 70
Elasticity = (dQ/dP)*(P/Q) = -(1/2)*(70/15) = - 7/3
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楼主: sl923121
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