What is the average unit price of Tokyo Traders' products?
"Tokyo Traders" is the CompanyName; average unit price = AVG(UnitPrice)
SELECT SUM(T1.UnitPrice) / COUNT(T2.SupplierID) FROM Products AS T1 INNER JOIN Suppliers AS T2 ON T1.SupplierID = T2.SupplierID WHERE T2.CompanyName = 'Tokyo Traders'