Pineapple Upside-Down Cake
["white cake mix", "1 can pineapple (medium size), cut in rings", "1/2 cube margarine", "1 c. brown sugar"]
["Mix cake mix according to directions.", "In cake pan pour melted margarine and sprinkle brown sugar on top of margarine.", "Arrange pineapple slices on top of brown sugar.", "Spoon cake batter over mixture and bake at 350\u00b0 for 40 minutes."]
["white cake", "pineapple", "margarine", "brown sugar"]