Required information [The following information applies to the questions displayed below.] Causwell Company began 2021 with 20,000 units of inventory on hand. The cost of each unit was $4.00. During 2021 an additional 40,000 units were purchased at a single unit cost, and 30,000 units remained on hand at the end of 2021 (30,000 units therefore were sold during 2021). Causwell uses a periodic inventory system. Cost of goods sold for 2021 , applying the average cost method, is $129,000. The company is interested in determining what cost of goods sold would have been if the FIFO or LIFO methods were used. Required: 2. Determine the cost of goods sold for 2021 using the LIFO method. (Do not round intermediate calculations.)