Inventory records for Herb's Chemicals revealed the following: March 1, 2021, inventory: 1,000 gallons @ $7.20 per gallon = $7,200 Purchases: Sales: Mar. 10 600 gals @ $ 7.25 Mar. 5 400 gals Mar. 16 800 gals @ $ 7.30 Mar. 14 700 gals Mar. 23 600 gals @ $ 7.35 Mar. 20 500 gals Mar. 26 700 gals The ending inventory under a periodic inventory system assuming average cost (rounding unit cost to three decimal places) is: