please help i have been struggling trying to solve this question!!

Sheridan Company uses a periodic inventory system and reports the following for the month of June. (a) Compute the cost of the ending inventory and the cost of goods sold under (1) FIFO, (2) LIFO, and (3) average-cost. (For calculation purposes, round average cost per unit to 2 decimal places, e.g. 5.25. Round answers to 0 decimal places, es. 125.)