The ledger of Custer Company has the following work in process account.
Work in Process—Painting
5/1 Balance is 4,390
5/31 Materials 5,690
5/31 Labor 3,690
5/31 Overhead 2,160
5/31 Balance ?
5/31 Transferred out ?

Production records show that there were 430 units in the beginning inventory, 30% complete, 1,490 units started, and 1,460 units transferred out. The beginning work in process had materials cost of $2,690 and conversion costs of $1,700. The units in ending inventory were 40% complete. Materials are entered at the beginning of the painting process.

Calculated that there were 460 units in process at May 31.

Question is:
What is the unit materials cost for May?