if we graph Mary Granola's indifference curves with avocados on the horizontal axis and grapefruits on the vertical axis, then whenever she has more grapefruits than avocados, the slope of her indifference curve is -2.Whenever she has more avocados than grapefruits, the slope is -1/2.Mary would be indifferent between a bundle with 9 avocados and 21 grapefruits and another bundle with 19 avocados and
A)7 grapefruits.
B)17 grapefruits.
C)10 grapefruits.
D)13 grapefruits.
E)11.50 grapefruits.

Question

Quizplus · Accepted Answer

To determine which bundle Mary prefers, we need to compare the slopes of the indifference curves at each bundle.
For the first bundle with 9 avocados and 21 grapefruits, the slope of the indifference curve is (21-10)/(9-0) = 11/9.
For the second bundle with 19 avocados and 10 grapefruits, the slope of the indifference curve is (10-5)/(19-0) = 1/3.
Since 1/3 is less than 11/9, Mary prefers the second bundle with 19 avocados and 10 grapefruits. Therefore, the best choice is choice C) 10 grapefruits.

If We Graph Mary Granola's Indifference Curves with Avocados on the Horizontal