The Painting Department transferred 6,000 units to the finished goods storeroom during a month. There was no beginning work in process inventory, but 800 units were still in process at the end of the month, and were 70% complete, and production costs incurred totaled $21,320. Inventory costs would be determined using a unit cost of

$3.55.

$3.42.

$3.25.

$3.14.