During March, a company had beginning inventory, purchases, and sales as follows: SALES Units $sale/unit PURCHASES Units Cost/Unit Beg Inventory 400 $20 Apr. 6 purchase 240 24 Apr 11 360 40 Apr. 18 purchase 420 26 Apr 28 500 41 Calculate the cost of Goods Sold for each of the above sales for a perpetual inventory system under each of the following methods (entries are not required): FIFO