(Solution) - In April Frieda pays 2 apiece for eggs and 1 -(2025 Original AI-Free Solution)

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In April, Frieda pays $2 apiece for eggs and $1 apiece for sodas. Her income is $40. She buys 18 eggs and 4 sodas. In May, Frieda pays $1 apiece for eggs and $2 apiece for sodas. Her income is $40. She buys 16 eggs and 12 sodas.
a. In which month is Frieda happier?
b. Are eggs a normal or an inferior good for Frieda?