price elasticity of supply between points A and B

Principles of Economics 2e
2nd Edition
ISBN:9781947172364
Author:Steven A. Greenlaw; David Shapiro
Publisher:Steven A. Greenlaw; David Shapiro
Chapter5: Elasticity
Section: Chapter Questions
Problem 35P: The equation for a supply curve is 4P=Q. What is the elasticity of supply as price rises from 3 to...
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I am using graph showing Quantity A of 8 and a Price of $12 and also shows Quantity B of 10 and a Price of $15, what would be the price elasticity of supply between points A and B? 

I keep coming up with 1, but my answer was marked wrong? 

 

Please round the answer to one decimal place

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