If the quantity demanded of textbooks decreases by 40% when the price of a textbook rises by 100% what is the price elasticity of demand for textbooks?

Economics (MindTap Course List)
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ISBN:9781337617383
Author:Roger A. Arnold
Publisher:Roger A. Arnold
Chapter19: Elasticity
Section: Chapter Questions
Problem 4WNG: The quantity supplied of a good rises from 120 to 140 as price rises from 4 to 5.50. What is the...
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If the quantity demanded of textbooks decreases by 40% when the price of a textbook rises by 100% what is the price elasticity of demand for textbooks? 
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