Mini-Exercise 5.6 e Cost flow assumptions-FIFO and LIFO using a periodic system The beginning inventory was 600 units at a cost of $20 per unit. Goods available for sale during the year were 2,600 units at a total cost of $57,600. In May. 1.200 units were purchased at a total cost of $26,400. The only other purchase transaction occurred during October. Ending inventory was 1,100 units. Required: a. Calculate the number of units purchased in October and the cost per unit pur- chased in October b. Calculate cost of goods sold and ending inventory under the following cost flow assumptions (using a periodic inventory system): 1. FIFO 2. LIFO