Alhekma Co. uses a periodic inventory system. Its records show the following for the month of September, in which 200 units were sold. Unit Cost September 1 September 12 September 23 Inventory Purchase Purchase Units 300 500 400 Total Cost $1,800 3,500 3.200 Instructions a. Compute the ending inventory at September 30 and cost of goods sold using the FIFO and LIFO methods. (2+2=4 marks) b. Which costing technique results in the higher ending inventory? Justify your answer. (0.5+0.5= 1 marks) c. Which costing technique gives the higher cost of goods sold? Justify your answer. (0.5+0.5= 1 marks)