Case #1: If sku sale-price is less than list-price, sale price will be added to the basket. Case #2: If sku sale-price is equivalent to list price, sale price will be added to the basket. Case #3: If sku sale-price is greater than list-price, sale price will be added to the basket. In all situations, sale-price will be displayed and add to the cart basket, because, the sale-price will override the list-price.