If the quantity demanded of a commodity increases from 20 units to 30 units when there is an increase in price from $4.00 to $5.00, the elasticity of demand is
e = ∆Qd/∆P x P/Qd = 30 - 20/ 5 - 4 x 4/ 20 = 10/1 x 4/20 = 2
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