The Demand for Good X Is Estimated to Be Q_x^d

The demand for good X is estimated to be Q_x^d = 10,000 − 4P_X + 5P_Y + 2M + A_X, where P_X is the price of X,P_Y is the price of good Y,M is income,and A_X is the amount of advertising on X.Suppose the present price of good X is $50,P_Y = $100,M = $25,000,and A_X = 1,000 units.Based on this information,we know that the demand for good X is:

A) elastic.
B) inelastic.
C) unitary elastic.
D) neither elastic, inelastic, nor unitary elastic.