I need help on these 2 questions becasue ive been struggling

Inventory by Three Methods; Cost of Goods Sold The units of an item available for sale during the year were as follows: There are 18 units of the item in the physical inventory at December 31. Determine the cost of ending inventory and the cost of goods sold by three methods, presenting your answer Round your final answers to the nearest dollar. Imvestury by thene Methods There are 48 units of the item in the physical inventory at Decumber 31 . The periodic inyertury livatem is used. Determine the inventory cost under each of the following methods. a. Determine the inventory cost by using the first-in, first-out mothod, b. Determine the inventory cost by using the last-in, firit-out method. c. Determine the irwentory cost by using the weighted average cost method. Round intermediate calculation to cents then reund final answer ta thr nearest whole doltar