Sales during the year were 1,100 units. Beginning inventory was 350 units at a cost of $6 per unit. Purchase 1 was 550 units at $7 per unit. Purchase 2 was 850 units at $8 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.) 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.)