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If we move from 8 to 6, the elasticity of demand is_______

Demanded
8 10
6 12


If we move from 8 to 6, the elasticity of demand is_______
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  • A -1.25
  • B 0.62
  • C 1.25
  • D 1
Correct Answer: Option C
Explanation:
The elasticity of demand is calculated using:
ρd = % Δ in P[hr] % Δ in Q


Where P = PriceQ = Quantity Demanded
Therefore,

% Δ in P = 6 - 8[hr] 8 x 100
= -25%
% Δ in Q = 12 - 10[hr] 10 x 100
= 20%

ρd = -25[hr] 20 = -1.25 = 1.25


NOTE: Elasticity of demand is always positive. Therefore, the negative sign is ignored or In extra negative sign is introduced to make it positive. So the answer is 1.25

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