Trey Monson starts a merchandising business on December 1 and enters into three inventory purchases:

December 7 10 units @ $ 7 cost December 14 20 units @ $ 8 cost December 21 15 units @ $10 cost Units Unit Cost Beginning inventory on January 1 . . . . . . . 320 $3.00 Purchase on January 9 . . . . . . . . . . . . . . . 85 3.20 Purchase on January 25 . . . . . . . . . . . . . . 110 3.30 Monson sells 15 units for $20 each on December 15. Eight of the sold units are from the December 7 purchase and seven are from the December 14 purchase. Monson uses a perpetual inventory system.

Determine the costs assigned to the December 31 ending inventory based on

(a) FIFO,

(b) LIFO,

(c) weighted average, and (d ) specific identification.