Q 8

In Problem 1, Charlie's utility function is U(A, B) = AB, where A and B are the numbers of apples and bananas, respectively, that he consumes. If Charlie is consuming 40 apples and 160 bananas, then if we put apples on the horizontal axis and bananas on the vertical axis, the slope of his indifference curve at his current consumption is
A) -4.
B) -8.
C) -41.
D) .

Q 9

In Problem 1, Charlie's utility function is U(A, B) = AB, where A and B are the numbers of apples and bananas, respectively, that he consumes. If Charlie is consuming 30 apples and 120 bananas, then if we put apples on the horizontal axis and bananas on the vertical axis, the slope of his indifference curve at his current consumption is
A) -31.
B) -8.
C) .
D) -4.

Q 10

In Problem 2, Ambrose has the utility function U(x_{1}, x_{2}) . If Ambrose were initially consuming 49 units of nuts (good 1) and 12 units of berries (good 2), then what is the largest number of berries that he would be willing to give up in return for an additional 32 units of nuts?
A) 9
B) 21
C) 8
D) 4
E) 2