help me figure out the last question please

Sunland Company uses a perpetual inventory system and reports the following for the month of June. Calculate the weighted-average cost per unit, using a perpetual inventory system. Assume a sale of 400 units occurred on June 15 for a selling price of $8 and a sale of 40 units on June 27 for $9. (Round intermediate calculations to 0 decimal places, eg. 152 and final answers to 3 decimal places, eg. 5.125.) June 1 June 12 June 15 June 23 June 27 Calculate the cost of the ending inventory and the cost of goods sold for each cost flow assumption, using a perpetual inventory system. Assume a sale of 400 units occurred on June 15 for a selling price of $8 and a sale of 40 units on June 27 for $9. (Round answers to 0 decimal places, es. 125.) eTextbook and Media