peridic inventory using fifo, lifo, and weighted average cost methods... plz help me!

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. 1 9 units at $38 Inventory Purchase Purchase $342 656 Aug. 7 Dec. 11 16 units at $41 10 units at $43 430 35 units $1,428 There are 18 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 (c) 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) b. Last-in, first-out (LIFO) c. Weighted average cost