The percent change in quantity demanded when the price of a used car falls from $6,000 to $4,000 is -33.33%
Elasticity of demand = percentage change in demand / percentage change in price
% change in price = (2000/6000) * 100
= 33.33 %
Percentage change in demand = -1 × 33.33%
= -33.33%
Price elasticity of demand is the degree of responsiveness of demand to a little change in price
Learn more about change in quantity demanded:
https://brainly.com/question/24961010