The following linear demand specification is estimated for Conlan Enterprises, a price-setting firm:Q = a + bP +cM +dPRwhere Q is the quantity demanded of the product Conlan Enterprises sells, P is the price of that product, M is income, and PR is the price of a related product. The results of the estimation are presented below: 
Assume that the income is $10,000, the price of the related good is $40, and Conlan chooses to set the price of this product at $30. At the prices and income given above, what is the price elasticity of demand?
A. -0.86
B. -0.43
C. -1.00
D. -2.40
E. -1.43
Answer: B
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