How much would be the total sales profit for shopping cart ID 20621 ?
Sales profit = MULTIPLY(SUBTRACT(ListPrice, StandardCost; Quantity)), where ShoppingCartID = '20621'
SELECT SUM((T1.ListPrice - T1.StandardCost) * T2.Quantity) FROM Product AS T1 INNER JOIN ShoppingCartItem AS T2 ON T1.ProductID = T2.ProductID WHERE T2.ShoppingCartID = 20621