Answer:
ending inventory using FIFO = $11,700
ending inventory using LIFO = $7,500
ending inventory using average method = $9,435
Explanation:
 date         item                               units             price             total
Jan. 1        beginning inv.             2,500             $5             $12,500    
Feb. 17     purchase                      3,300             $6             $19,800
July 21      purchase                     3,000             $7             $21,000
Nov. 23    purchase                      1,200             $8              $9,600
total                                              10,000                             $62,900
Dec. 31     ending inv.                   1,500                              
ending inventory using FIFO = (1,200 x $8) + (300 x $7) = $11,700
ending inventory using LIFO = 1,500 x $5 = $7,500
ending inventory using average cost = 1,500 x $6.29 = $9,435