Answer:
Step-by-step explanation:
FIFO inventory costing method uses the assumption that the first set of inventory is the first to be sold.
 Purchase
 Month Unit rate Cost
January 10 120 1200
February 20 125 2500
May 15 130 1950
September 12 135 1620
November 10 140 1400
Total 67
  Sales (FIFO)
January  6 120 720 
February 4 120 480
 1 125 125
May 9 125 1125
September 8 125 1000
November 2 125 250
 11 130 1430
  Closing Inventory
May 4 130 520
September 12 135 1620
November 10 140 1400
 3540