4. Beginning inventory and purchases for September for Delight Co. are shown below. Also, the company sold 1,700 units at the end of the month at a price of $140 per unit. (1) Assume a periodie inventory system (as we did in class). Calculate the amount of ending inventory and cost of goods sold under each of the following cost flow methods. (2) Assume that the company uses the FIFO Periodic inventory method. Calculate the amount of gross margin (also known as gross profit) for the month