What is the average profit of all the low class universal road frames? Indicate how many variety of sizes are there and the available colors.
low class refers to Class = 'L'; universal refers to Style = 'U'; road frame is a name of product subcategory; average profit = AVG(SUBTRACT(ListPrice, StandardCost);
SELECT AVG(T1.ListPrice - T1.StandardCost), COUNT(DISTINCT T1.Size) , COUNT(DISTINCT T1.Style) FROM Product AS T1 INNER JOIN ProductSubcategory AS T2 ON T1.ProductSubcategoryID = T2.ProductSubcategoryID WHERE T1.Class = 'L' AND T2.Name = 'Road Frames' GROUP BY T1.Class, T1.Color