A summary of inventory records for Duren Company reveals the following: Inventory on January 1,2016 Inventory purchased in 2016 Total cost of goods available for sale in 2016 30 units@S600 each 20 units S860 eaclh 50 units $18,000 2.200 $35,200 During 2016, 35 units were sold at S1,200 per unit for total sales revenue of $42,000. Compute cost of goods sold, gross profit, and the inventory balance for the current period under FIFO, LIFO, and weighted-average cost methods