Sales during the year were 820 units. Beginning inventory was 280 units at a cost of $7 per unit. Purchase 1 was 410 units at $8 per unit. Purchase 2 was 640 units at $9 per unit. Required a. 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 | # of units #of Cost per Available for units Cost of Goods Soldinve # of units in ending Cost per Ending Cost per unit unit sold unit Inventory Sale Beg. Inventory Purchase 1 Purchase 2 Total b. 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 Sale Cost of Goods Sold Inventory Balance Cost of lfof units unit Goods Sold in ending Cost of Goods #of Cost per Available for units | # of units | Cost per Cost per Ending sold unit Inventory Sale Beg. Inventory Purchase1 Purchase 2 Total 0 0 0