Nordic Industries uses a periodic inventory system. During its first month of operations, Nordic Industries purchased inventory as follows: Units Unit Cost Total Cost January 3 150 $15. $2,250 January 12 200 20 4,000 January 20 250 20 5,000 January 25 300 30 9,000 900 $ 20,250 There were 100 units in ending inventory on January 31. Under the LIFO cost method, what is the cost of goods sold for january? $19,500 $18,000 O $17,250 $18,750