Which of the following pairs of equations describes the supply and demand curves given in the accompanying demand and supply tables?PriceQuantity SuppliedQuantity Demanded$20040$251040$302040$353040$404040$455040
A. Qs = 2P - 40; Qd = 40, respectively
B. Qs = P - 20; Qd = 40, respectively
C. Qs = P - 40; Qd = 40P, respectively
D. cannot be determined
Answer: A
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