Given the demand function QD = 18 − 3P, answer the following ques- tions. (a) Calculate the price elasticity of demand if the price increases from P1 = 2 to P2 = 5 using the midpoint method. (b) Calculate the point price elasticity of demand at QD = 13.5. (c) At which price/quantity is demand unit elastic?

Economics:
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Chapter20: Elasticity: Demand And Supply
Section: Chapter Questions
Problem 13E: Using the following equation for the demand for a good or service, calculate the price elasticity of...
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Given the demand function QD = 18 − 3P, answer the following ques-
tions.
(a) Calculate the price elasticity of demand if the price increases from
P1 = 2 to P2 = 5 using the midpoint method.
(b) Calculate the point price elasticity of demand at QD = 13.5.
(c) At which price/quantity is demand unit elastic?
(d) At which price/quantity is demand perfectly elastic and perfectly
inelastic, respectively? 

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