4. Emma consumes apples and bananas only. Her utility function is given by u(XA,XB) = XAXB. The price of apples is $1, the initial price of bananas is $2, and Emma's daily income is $40. The price of bananas suddenly goes down to $1. (a) Find Emma's optimal daily consumption bundle before and after the change of the price. (b) Illustrate graphically the substitution and income effects in both cases.

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