Pineapple Upside Down Cake
["1 box Duncan Hines yellow cake mix", "1 cube margarine", "1 c. brown sugar", "1 (No. 2) can crushed pineapple (sweetened in own juice)"]
["Melt margarine in 9 x 13-inch dish.", "Stir in brown sugar. Spread evenly in dish.", "Add pineapple.", "Spread evenly in dish over the brown sugar.", "Sprinkle 4 to 6 tablespoons over pineapple. Pour batter over this.", "Bake at 350\u00b0 for 30 to 40 minutes until done."]
["margarine", "brown sugar", "pineapple"]