Inventory records for Herb's Chemicals revealed the following: March 1, 2021, inventory: 1,800 gallons a $8.8 per gallon = $15.840 Purchases: Mar. 10 Mar. 16 Mar. 23 760 gals @ $8.85 960 gals @ $8.90 760 gals @ $8.95 Sales: Mar. 5 Mar. 14 Mar. 20 Mar. 26 560 gals 860 gals 660 gals 860 gals The ending inventory under a periodic inventory system assuming average cost (rounding unit cost to three decimal places) is: Multiple Choice $11,860. Multiple Choice $11,860. $11,890. $11,788 $11,870