Can someone please explain how to calculate the ending inventory and cost of goods sold for each of these four and where the numbers come from!

1. Mojo Industries tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing method at the end of each period, as if it uses a periodic inventory system. Assume its accounting records provided the following information at the end of the accounting period, January 31. The inventory's selling price is $9 per unit. Transactions Unit Cost Units Total Cost Inventory, January 1$ 2.50 250 $ 625 Sale, January 10 (200) Purchase, January 12 3.00 300 900 Sale, January 17 (150) Purchase, January 26 4.00 80 320 Assume that for Specific identification method the January 10 sale was from the beginning inventory and the January 17 sale was from the January 12 purchase. Compute the amount of goods available for sale, ending inventory and cost of goods sold at January 31 under each of the following inventory costing methods: Cost of Goods Available Ending inventory for Sale Cost of Goods Sold Weighted average First In, First Out List In, First Out Specific Identification