help pls

Headlands Industries uses a periodicinventory system. its records show the following for the month of May in which 77 units were: sold. (a) Your answer is correct. Calculate the weighted-average unit cost. (Round answer to 3 decimol places, eg. 5.125.) Weighted-average unit cost $ eTextbook and Media. Attemptsi 2 of 5 used (b) Your aniber is incorrect. Calculate the ending inventory at May 31 using the FIFO, LIFO and average-cost methods. (Round answers to 0 decimal places, e.g.125.)