Help please! Need the math behind this to be explained..

Contact Us T CarowindsX9 x G womens black ultragrange rapXBlack And white I Society6xL ChHw warmens black (- , C Not Secure hm.tpx Inventory, January 1 Sale, January 10 Purchase, January 12 Sale, January 17 Purchase, January 26 Unit CostUnitsTotal Cost 310 (210) 360 (160) 80 $5.50 6.00 7.00 $1,705 2,160 560 Assuming that for Specific identification method (item 1d) the January 10 sale was from the beginning inventory and the January 17 sale was from the January 12 purchase. Required 1. 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: (Round your intermediate calculations to 2 decimal places and final answers to the nearest dollar amount.) Amount of Goods Ending Inventory Cost of Goods Sold a. Weighted average cost b. First-in, first-out c. Last-in, first-out d. Specific identification Available for Sale 4.425 4,425 4,425 4,425 2-a. Of the four methods, which will result in the highest gross profit