The accounting records of Whispering Winds Corp. show the following data Beginning inventory Purchases Sales 3,010 units at $6 8,130 units at $8 9,090 units at $11 Calculate average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Average unit cost $ per unit Determine cost of goods sold during the period under a periodic inventory system using the FIFO method, the LIFO method, and the average-cost method. (Round answers to O decimal places, eg. 125.) FIFO LIFO Average-cost Cost of goods sold $