Required information [The following information applies to the questions displayed below] Laker Company reported the following January purchases and sales data for its only product. The Company uses a perpetual inventory system. For specific identification, ending inventory consists of 310 units from the January 30 purchase, 5 units from the January 20 purchase, and 30 units from beginning inventory. he Company uses a periodic inventory system. For specific identification, ending inventory consists of 310 units from the January 30 furchase, 5 units from the January 20 purchase, and 30 units from beginning inventory. Determine the cost assigned to ending nventory and to cost of goods sold using (a) specific identification, (b) weighted average, (C) FIFO, and (d) LIFO. b) Weighted average - Periodic