What is the total amount due of all the purchases made by the company to the vendor that has the lowest selling price amount of a single product? Indicate the name of the vendor to which the purchases was made.
Vendor's selling price of a single product refers to UnitPrice;
SELECT T1.UnitPrice, T3.Name FROM PurchaseOrderDetail AS T1 INNER JOIN PurchaseOrderHeader AS T2 ON T1.PurchaseOrderID = T2.PurchaseOrderID INNER JOIN Vendor AS T3 ON T2.VendorID = T3.BusinessEntityID ORDER BY T1.UnitPrice LIMIT 1