Bernice's utility function is U(x, y)= min{x, y}.The price of x used to be 3 but rose to 4.The price of y remained at 1.Her income is 12.She would need an income of $15 to be able to afford a bundle as good as her old one at the new prices.

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Bernice's utility function indicates perfect complements, so she consumes equal amounts of x and y. Initially, she could buy 3 units of each (3x3 + 3x1 = 12). With new prices, to buy 3 units of each, she needs 3x4 + 3x1 = 15.

Bernice's Utility Function Is U(x, Y)= Min{x, Y}