Tasty pineapple cake

Ingredients

• reduced-calorie margarine
  1/2 cup
• sugar substitute to equal
  1 unit
• -2 ½ cups Sugar

  divided
  1 unit
• eggs
  2 unit
• all-purpose flour
  1 1/2 cup
• baking powder
  1 tsp
• baking soda
  1/2 tsp
• salt
  1/2 tsp
• milk
  1/2 cup
• unsweetened pineapple
  4 slice
• -canned drained
  1 unit
• vegetable cooking spray.
  1 unit
• unsweetened pineapple juice
  1/2 cup