The United Carpentry Company uses the system of periodic inventory inventory, and the following are the details of the purchases made during the financial period: 2019/12/1 2000 7 2019/8/1 4000 8 Note that the balance at the beginning of the period 2019/5/1 6000 5 2019/2/1 4000 6 the date number of units unit price 2000 units at a price of 7 dinars per unit, and 14,000 units were sold at a price of 10 dinars one unified Required First: Determining the cost of commodity inventory at the end of the period and the cost of goods sold (cost of sales) according to the following methods: First: first-in, first-out method. Second: The last-in-first-out method. Third: the weighted average method. Second: Determine the total profit according to the previous three methods

Note that the balance at the beginning of the period was 2000 units at a price of 7 dinars per unit, and 14,000 units were sold at a price of 10 dinars