Price elasticity of demand of a good is (-)1 . When its price falls by one rupee , its demand rises from 16 to 18 units . Calculate the price before change.

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`E_(P)=(P)/(Q)xx(DeltaQ)/(DeltaP)`
`(-)1=(P)/(16)xx(2)/(-1)`
`2P=16orP=8(Rs.)`.

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