Assume that the quantity of X is measured on the horizontal axis, and the quantity of Y is measured on the vertical axis. Assume that the price of X is $3 and the price of Y is $6. If Amanda has $90 to spend on X and Y, then
A. she can buy, at most, 15 units of good X.
B. her budget line has a slope of ?3.
C. she can buy, at most, 30 units of good X.
D. her budget line has a slope of -2.
Answer: C
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