The beginning inventory was 420 units at a cost of $11 per unit. Goods avallable for sale during the year were 1,660 units at a total cost of $20,020. In May, 720 units were purchased at a total cost of $8,640. The only other purchase transaction occurred during October. Ending inventory was 730 units. Required: a. Calculate the number of units purchased in October and the cost per unit purchased in October Purchased in October Number of units 520 Cost per unit $ 135 b-1. Assume the periodic inventory system is used. Calculate cost of goods sold and ending inventory using FIFO method. (Enter all values as a positive value.) Cost of Goods Available for Sale Periodic FIFO Cost of Goods Sold Cost of Goods # of units Cost per unit # of units Cost per Available for sold unit Cost of Goods Sold Sale # of units in ending inventory Inventory Balance Cost per Ending unit Inventory Beg. Inventory 420 S 11 S 4,620 420 S 11 S 4,620 Purchases: May 720 12 8,640 October 520 13 6,760 Total 1,660 $ 20,020 420 $ 4,620 0 b-2. Assume the periodic inventory system is used. Calculate cost of goods sold and ending inventory using LIFO method. (Enter all values as a positive value.) Periodic LIFO Cost of Goods Available for Salo Cost of Goods Sold of units Cost per unit Cost of Goods Available for Sale W of units sold Cost per unit Cost of Goods Sold # of units in ending inventory Inventory Balance Cost per unit Ending Inventory Beg Inventory Purchases: May October Total