periodic inventory by three methods. can someone help me please.

Periodic Inventory by Three Methods; Cost of Merchandise Sold The units of an item available for sale during the year were as follows: Jan. 1 Inventory 30 units 5108 Mar 10 Purchase 50 units 5118 Aug. 30 Purchase 20 units 5122 Purchase 100 units 5126 There are 40 units of the item in the physical inventory at December 31. The periode inventory system is used Determine the Inventory cosy and the cost of merchandise sold by three methods. Round interim calculations to one decimal and final answers to the nearest whole cute Dec. 12 Cost of Merchandise Inventory and cost of Merchandise Sold Inventory Method Merchandise Inventory Merchandise Sold First-in, first-out (FIFO) Last-in, first-out (LIFO) Weighted average cost