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d. -0.4 e. None of the above 20. Bill's utility function is U(x, y) - x y'. If good x is drawn on the horizontal axis and good y is drawn on the vertical axis, then what is the slope of Bill's indifference curve when his consumption bundle is (1. 25)? a. -100 b. -200 C. -300 d. -400 e. None of the above