5. Suppose that when the price of good X falls from $10 to $8, the quantity demanded of good Y rises
from 20 units to 25 units. Using the midpoint method, the cross-price elasticity of demand is
(A) -1.0, and X and Y are complements.
(B) -1.0, and X and Y are substitutes.
(C) 1.0, and X and Y are complements.
(D) 1.0, and X and Y are substitutes.
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