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Lan's utility function is U(x,y) =8.2 x2.3y5.2. If the price of good X is 4.2 and...

Lan's utility function is U(x,y) =8.2 x2.3y5.2. If the price of good X is 4.2 and Lan's optimal bundle has x*=2.8 units of good X and y*=5 units of good Y, what is the price of good Y?

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