ABC Co uses perpetual inventory system and Average Cost Method. The company's information for December 2021 is as follows: December 1- Beginning inventory value is $ 800 in total for 20 units of inventory. December 7- Sold 10 units $50 each. December 12- Purchased 15 units at the cost of $42 each. December 17- Sold 8 units $50 each. December 23-Sold 4 units $50 each. December 27-Purchased 8 units at the cost of $44 each. December 30- Sold 10 units $50 each. What is the total value of ending inventory by end of December, 2021? (FYI: round the value to the nearest 10) Select one: a. 536 b. 700 c. 887 d. 465