please help with calculations,I need to understand step by step

Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods The units of an item available for sale during the year were as follows Jan. I Inventory 9 units at $50 $450 Aug. 7 Purchase 18 units al s52 936 Dec. 11 Purchase 13 units at s54 702 40 units $2,088 There are 20 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost using (a) the first-in, first-out (FIFO) method; (b) the last-in, first-out (LIFO) method; and () the weighted average cost method (round per unit cost to two decimal places and your final answer to the nearest whole dollar). a. First-in, first-out (FIFO) s b. Last-in, first-out (LIFO) $ c Weighted average cost s 2 more Check My Work uses remaining