11. 38
(According to midppoint method of elasticity of demand,
elasticity = Percentage change in quantity demanded/Percentage
change in price = -2
So, Percentage change in price = Percentage change in quantity
demanded/-2 = 20%/-2 = 0.2/-2 = -0.1
Percentage change in price =
So, (2P-84)/(P+42) = -0.1
So, 2P-84 = -0.1(P+42)
So, 2P-84 = -0.1P - 4.2
So, 2P + 0.1P = 84 - 4.2
So, 2.1P = 79.8
So, P = 79.8/2.1
So, P = 38)
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