Write SQL query to solve given problem: How much would be the total sales profit for shopping cart ID 20621 ?. Keep the solution inside sql tag ```sql [SQL-Query] ```
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