Can you also explain how you get the units for each

Richmond Company's inventory records for its retail division show the following at January 31: Click the icon to view the accounting records.) At January 31, 8 of these units are on hand Read the requirements Requirement 1. Compute cost of goods sold and ending inventory, using each of the following four inventory methods: Begin by entering the number of units sold and number of units in ending inventory. Then calculate cost of goods sold and ending Inventory using (a) specific identification, then (b) average cost, then (c) FIFO, and finally (C) LIFO (Round the average cost per unit to the nearest cent. Round all final answers to the nearest whole dollar) Number of units Cost of goods sold Ending inventory Requirements Data table 1. Compute cost of goods sold and ending Inventory, using each of the following methods: a. Specific identification, with two $165 units and six $175 units still on hand b. Average cost at the end Jan 1 Jan 15 c. FIFO d. LIFO Beginning inventory 6 units $165 = $990 Purchase 5 units @ $166 = $830 Purchase 9 units @ $175 $1,575 on Jan 26 2. Which method produces the highest cost of goods sold? Which method produces the lowest cost of goods sold? What causes the difference in cost of goods sold