Morgenstern Ltd. has the following units and costs for the month of April. Beginning inventory, April 1, 1,000 units at $20 (Cost) Purchase 1, April 9, 1,200 units at $23 (cost) Sold, April 12, 2,100 units at $40 (Retail) Purchase 2, April 22, 800 units at $25 (Cost) If Morgenstern uses a perpetual inventory system, what is the cost of ending inventory under weighted average at April 30? (Note: Use four decimal places for per-unit calculations and round to the nearest dollar.) a. $20,280 b. $22,164 c. $$45,436 d. $47,320