7.1 Real Income Changes: Charlie has a utility function U(XA, XB) =XAXB. (a) The price of apples is $2, and the price of bananas is $3. Charlie's income is $60. Draw Charlie's budget line. (b) What bundle will maximize Charlie's utility subject to his budget constraint? Plot the bundle on Charlie's budget line, and label it A. (c) Now suppose that the price of bananas falls suddenly to $1. What would Charlie's income be if Charlie could just afford his original chosen bundle? (d) Draw the budget line corresponding to this income and the new prices