Answer:
\[{{E}_{P}}=\frac{\text{Percentage}\,\,\text{change}\,\,\text{in}\,\,\text{quantity}\,\,\text{demanded}}{\text{Percentage}\,\,\text{change}\,\,\text{in}\,\,\text{price}}\] \[-\,0.4=\frac{\text{Percentage}\,\,\text{change}\,\,\text{in}\,\,\text{quantity}\,\,\text{demanded}}{\text{5}}\] \[2\] = Percentage change in quantity demanded \[\therefore \] Quantity decreases by 2% or Demand falls by 2%
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