Easy Blueberry Dump Cake

1 pt. blueberries, sweetened
1   ( 15 oz. ) can crushed pineapple
1 box yellow cake mix
1/2 cup broken nuts
1 1/2 sticks margarine or butter, melted

Put berries in 6 x 11" greased baking dish. cover with pineapple.  Pour on dry cake mix and scatter nuts over top.  Melt margarine and drizzle over all.  Bake 1 hour at 350 F.  Serve with ice cream or whipped cream.