Struggling on this area of my homework. Can someone solve the incorrect bits and explain how you got it?

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 385 units from the January 30 purchase, 5 units from the January 20 purchase, and 15 units from beginning inventory. Company uses a periodic inventory system. For specific identification, ending inventory consists of 385 units from the January 30 chase, 5 units from the January 20 purchase, and 15 units from beginning inventory. Determine the cost assigned to ending entory and to cost of goods sold using (a) specific identification, (b) weighted average, (c) FIFO, and (d) LIFO. a) Specific Identification c) Periodic FIFO d) Periodic LIFO