Please calculate the average unit price for products of Formaggi Fortini s.r.l.
"Formaggi Fortini s.r.l." is the CompanyName; average unit price = AVG(UnitPrice)
SELECT SUM(T1.UnitPrice) / COUNT(T1.SupplierID) FROM Products AS T1 INNER JOIN Suppliers AS T2 ON T1.SupplierID = T2.SupplierID WHERE T2.CompanyName = 'Formaggi Fortini s.r.l.'