Sheridan Company began the year with 10 units of marine floats at a cost of $10 each. During the year, it made the following purchases: May 5, 31 unit at $15; July 16, 17 units at $21; and December 7, 22 units at $25. Assume there are 25 units on hand at the end of the period. Sheridan uses the periodic approach. Determine the cost of goods sold under FIFO. Determine the cost of goods sold under LIFO. Calculate average unit cost. (Round answer to 2 decimal places, e.g. 5.12.) Determine the cost of goods sold under average-cost. Average-Cost Cost of good sold.