Ellie is spending her entire income on goods X and Y. Her marginal utility from the last unit of X is 100 and the marginal utility from the last unit of Y that she consumes is 50. Ellie's utility is only maximized if
A. the price of good X is twice that of good Y.
B. the price of good Y is twice that of good X.
C. the prices of X and Y are the same.
D. We cannot determine whether Ellie is maximizing her utility.
Answer: A
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