Price elasticity of demand of a good is (-) 2. At a price of Rs. 10 per unit 40 units of this good are bought . How units will be bought at a price of Rs. 11 per unit ? Calculate.

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`E_(P)=(P)/(Q)xx(DeltaQ)/(DeltaP)`
`(-)2=(10)/(40)xx(DeltaQ)/(1)`
`(-)80=10DeltaQ`
`DeltaQ=-8`
New `Q=Q+DeltaQ=40+(-8)=32` units.

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