Mayonnaise chocolate cake

Ingredients

• 1 cup sugar
• 1/2 cup cocoa
• 2 cups flour
• 2 tsp baking soda
• 1 cup water
• 1 cup Hellmans mayo
• 1 tsp vanilla
• Frosting
• 2 cups icing sugar
• 1/4 cup cocoa
• 1/3 cup margarine
• 1 beaten egg
• 1 tsp vanilla