42. The following data is available for one of the products sold by Wild Optics Company, which uses the periodic inventory system: Dec. 1 On hand, 10 units at $8.00 each $80 5 Purchased 30 units at $7.80 each $234 $326 $165 S 805 18 Purchased 40 units at $8.15 each 24 Purchased 20 units at $8.25 each Available for sale during December 100 units At the end of December, Wild Optics had 25 units on hand. The 75 units sold created revenue of $13 each. Determine the amounts for the December 31 ending inventory, the cost of goods sold for December, and the gross margin for December for each of the inventory costing methods listed below Cost of goods Gross Prof Inventory sold Weighted LIFO