Zachary completed the inventory count on December 31, 2020 and determined that there is an impairment in value for certain merchandise inventory items. The historic cost for these items is $12,000 and their net realizable value is $9,500. Required: Prepare the journal entry to record the inventory impairment. 3A. Data Set #1: December 1, 2020 December 5, 2020 December 18, 2020 Beginning inventory Inventory purchase Inventory purchase 50 units 50 units 20 units Unit Cost $10 $15 $20 Assume that 80 units are sold on December 31, 2020, 80 units are sold and the selling price was $20 per unit. Required - TASK 3A: (Round calculations to 2 decimal places and show all supporting calculations.) a. Calculate the periodic ending inventory balance on December 31, 2020 in dollars ($) and units using the weighted average method. b. Calculate the periodic Cost of Goods Sold and Gross Profit for the month ending December 31, 2020 in dollars ($) using the weighted average method. 3B. Data Set #2: December 1, 2020 December 5, 2020 December 18, 2020 Beginning inventory Inventory purchase Inventory purchase 50 units 50 units 20 units Unit Cost $10 $15 $20 Assume that 80 units are sold during the month of December, 2020, as follows: Sales Price per Unit December 10, 2020 Sale 20 units $15 December 28, 2020 Sale 60 units $20 Required - TASK #3B: Show all supporting calculations. a. Calculate the perpetual ending inventory balance on December 31, 2020 in dollars ($) and units using the weighted average method. b. Calculate the perpetual Cost of Goods Sold and Gross Profit for the month ending December 31, 2020 in dollars ($) using the weighted average method