Sales during the year were 700 units. Beginning inventory was 400 units at a cost of $10 per unit. Purchase 1 was 500 units at $12 per unit. Purchase 2 was 300 units at $14 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.)