The demand for good X is estimated to be Qxd = 10,000 ? 4PX + 5PY + 2M + AX where PX is the price of X, PY is the price of good Y, M is income, and AX is the amount of advertising on X. Suppose the present price of good X is $50, PY = $100, M = $25,000, and AX = 1,000 units. What is the demand curve for good X?
A. 61,500
B. 61,500 ? 4PX
C. 61,300 ? 4PX
D. 61,300
Answer: B
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