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The demand curve for a product is given by the equation Q d = 22 - 0.2P When the price of the product is $10, the price - elasticity of demand is:
The demand curve for a product is given by the equation Q d = 22 - 0.2P
When the price of the product is $10, the price - elasticity of demand is:
A. - 0.1
B. - 2.5
C. - 4.5
D. - 5.0
Explain your answer.