Flounder Corp. uses a periodic inventory system and reports the following for the month of June. (a1) Calculate weighted-average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted-average unit cost $ (a2) Compute the cost of the ending inventory and the cost of goods sold under FIFO, LIFO, and average-cost. (Round answers to 0 decimal places, e.g. 125.)