s 4 ABC Inc. sells computers and uses perpetual inventory system. During the month of September, the company purchased 134 units of a particular type of computer, details of which are as follows: Purchase Date Units Unit Cost Purchased September 2 54 $870 September 16 46 $879 September 18 34 $880 On September 20, ABC Inc. sold 69 units of these computers at a price of $1,100 per unit. Instructions: a. Assuming that ABC Inc. uses FIFO cost flow assumption, compute cost of goods sold relating to the sale on September 20. b. Assuming that ABC Inc. uses LIFO cost flow assumption, compute cost of goods sold relating to the sale on September 20. c. Assuming that ABC Inc. uses average cost flow assumption, compute cost of ending inventory after the sale on September 20