The accounting records of Sheffield Corp. show the following data. Beginning inventory 3,000 units at $5 Purchases 9,500 units at $7 Sales 10,100 units at $10 (a) Your Answer Correct Answer (Used) Calculate average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Average unit cost $ $ 6.520 per unit (b) 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 decimal places, eg. 125.) FIFO LIFO Average-cost Cost of goods sold $