I am so confused on where to start for any of these and why. If someone could help that would be good. Thanks

Inventory Costing Methods-Perpetual Method Merritt Company uses the perpetual inventory system. The following May data are for an item in Merritt's inventory: May 1 Beginning inventory 150 units @ $30 per unit 12 Purchased 16 Sold 24 Purchased 100 units @ $35 per unit 180 units. 170 units @ $38 per unit Calculate the cost of goods sold for the May 16 sale using (a) first-in, first-out, (b) last-in, first-out, and (c) the weighted-average cost methods. Round your final answers to the nearest dollar A. First-in, First-out: Cost of Goods Sold: B. Last-in, first-out: Cost of Goods Sold C. Weighted-average cost: Cost of Goods Sold