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Assume a person has a utility function U = XY, and money income of $10,000, facing an initial price of X of $10 and price of Y of $15

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Assume a person has a utility function U = XY, and money income of

$10,000, facing an initial price of X of $10 and price of Y of $15. If the price of X increases to $15, answer the following questions:
a. What was the initial utility maximizing quantity of X and Y?
b. What is the new utility maximizing quantity of X and Y following the increase in the price of X?
c. Calculate the amount of substitution and income effects.
d. What can you say about good X, is it a normal good or inferior good? Explain.