Answer:
C. Increase cost of goods sold and decrease inventory by $16,400
Step-by-step explanation:
FIFO method Sales the Older Inventory Acquired first followed by the Recent Acquired Inventory.
Cost of Sales Calculation
January 20 : 2000 units × $4.00 = $8,000
2000 units × $4.20 = $8,400
Total = $16,400
Journal
Cost of Sales $16,400 (debit)
Inventory $16,400 (credit)