(Solution) - Repeat Calculus Problem 1 but assume that David has the -(2025 Original AI-Free Solution)

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Repeat Calculus Problem 1, but assume that David has the following preferences. Before he leaves, he would like to choose his spending to maximize the utility function
But on the first day of his trip, he would like to choose his spending to maximize the utility function
and on the second day he would like to choose his remaining spending to maximize the utility function