In its first month of operations, Literacy for the Illiterate opened a new bookstore and bought merchandise in the following order: (1) 300 units at $7 on January 1, (2) 450 units at $8 on January 8, and (3) 750 units at $9 on January 29. Assume 900 units are on hand at the end of the month. M7-22 (Static) (Supplement 7A) Calculating Cost of Goods Sold and Ending Inventory under Perpetual Weighted Average Cost [LO 7-S1] Calculate the cost of goods available for sale, cost of goods sold, and ending inventory under the weighted average cost flow assumptions. Assume perpetual inventory system and sold 600 units between January 9 and January 28