Inventory records for Herb's Chemicals revealed the following: March 1, 2021, inventory: 1,250 gallons a $77 per gallon = $9,625 Purchases: Mar. 10 Mar. 16 Mar. 23 650 gals @ $7.75 850 gals @ $7.80 650 gals @ $7.85 Sales: Mar. 5 Mar. 14 Mar. 20 Mar. 26 450 gals 750 gals 550 gals 750 gals The ending inventory under a periodic inventory system assuming average cost (rounding unit cost to three decimal places) is: Multiple Choice $6,905 o $7,007 e o $6,977