Inventory records for Herb's Chemicals revealed the following: March 1, 2021, inventory: 1,300 gallons @ $7.8 per gallon = $10,140 Sales: Purchases: Mar. 10 Mar. 16 Mar. 23 660 gals @ $7.85 860 gals @ $7.90 660 gals @ $7.95 Mar. 5 Mar. 14 460 gals 760 gals 560 gals 760 gals Mar. 20 Mar. 26 The ending inventory under a periodic inventory system assuming average cost (rounding unit cost to three decimal places) is: Multiple Choice O $7,391 $7,411. $7,381 O O $7,309 O