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, Use the information above to answer the following question. Under the weighted average cost method, what is the cost of goods sold for January O $3.150 $18,000 $2,250 $20,250