3. Suppose Amelie gets utility from stickers x1 and chocolate $2 whose prices are p1 and p2, and she has $M of pocket money. 3.1. Derive Amelie's demand function for stickers as function of p, and p2, and $M when u(X1, X2) = 21 1/2 + 2x2 . (4 points) 3.2. From your answer for 3.1), can you tell if chocolate is a substitute or complement for stickers (for Amelie)? (1 points) 3.3. Derive Amelie's demand function for stickers as function of all p1 # p2, and $M if her utility function is instead u(1, X2) = 1 + $2. Be careful! (4 points)