1 c  Butter; softened

    1/2 c  Margarine; softened

      3 c  Sugar

      5    Eggs

      3 c  All-purpose flour

    1/2 ts Baking powder

    1/2 ts Salt

    1/2 c  Cocoa

      1 c  Milk

      1 ts Vanilla extract

---------------------------BUTTER CREAM FROSTING---------------------------
    3/4 c  Margarine; softened

      3 oz Cream cheese; softened

        pn Salt
     16 oz Powdered sugar; plus

    1/2 c  Powdered sugar

    1/4 c  Milk; to 1/2 cup

      1 ts Vanilla extract

  Cream butter and margarine until smooth; add sugar and beat until
  light and fluffy.  Add eggs, one at a time, beating well after each
  addition.
  Combine dry ingredients, and add to creamed mixture alternately with
  milk and vanilla.  spoon batter into a well-greased 10 inch tube pan
  or Bundt pan.  Bake at 325 degrees for 35 minutes; reduce heat to 200
  degrees and bake an additional 35 to 40 minutes.
  Cool; spread with Butter Cream Frosting, and decorate as desired.
  Butter Cream Frosting: Cream margarine and cream cheese until light
  and fluffy.  Add salt and sugar, a small amount at a time, beating
  until smooth.  Slowly beat in just enough milk to make mixture
  spreadable; add vanilla.