E6.7 (lo 2), ap jeters company uses a periodic inventory system and reports the following for the month of june. compute inventory and cost of goods sold using periodic fifo, lifo, and average-cost. date explanation units unit cost total cost june 1 inventory 120 $5 $ 600 12 purchase 370 6 2,220 23 purchase 200 7 1,400 30 inventory 230 instructions a. compute the cost of the ending inventory and the cost of goods sold under (1) fifo, (2) lifo, and (3) average-cost. (round average unit cost to three decimal places.) b. which costing method gives the highest ending inventory? the highest cost of goods sold? why? c. how do the average-cost values for ending inventory and cost of goods sold relate to ending inventory and cost of goods sold for fifo and lifo?