The beginning inventory was 300 units at a cost of $10 per unit. Goods available for sale during the year were 1.300 units at a total cost of $14,400 In May, 600 units were purchased an a total cost of $6,600. The only other purchase transaction occurred during October. Ending inventory was 550 units. Required: Calculate the number of units purchased in October and the cost per unit purchased in October. Assume the periodic inventory system is used Calculate cost of goods sold and ending inventory using FIFO method. Assume the period inventory system is used Calculate cost of goods sold and ending inventory using LIFO method