What is the contact title for the person who supplied a product that is 10 boxes x 12 pieces.
"10 boxes x 12 pieces" is the QuantityPerUnit
SELECT T2.ContactTitle FROM Products AS T1 INNER JOIN Suppliers AS T2 ON T1.SupplierID = T2.SupplierID WHERE T1.QuantityPerUnit = '10 boxes x 12 pieces'