The supply function for good X is given by Qxs = 200 + 4PX - 3PY - 5PW, where PX is the price of X, PY is the price of good Y and PW is the price of input W. If PX = 500, PY = 250, PW = 30, then the supply curve is
A. Qxs = 1300.
B. Qxs = -700 + 4Px.
C. Qxs = 150 + 4Px.
D. Qxs = -550 + 4Px.
Answer: B
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