(Advanced analysis) Answer the question on the basis of the following information. The demand for commodity X is represented by the equation P = 10 - 0.2Q and supply by the equation P = 2 + 0.2Q. Refer to the given information. If demand changed from P =
10 - .2Q to P = 7 - .3Q, the new equilibrium quantity is:
A. 10.
B. 20.
C. 15.
D. 30.
Answer: A
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