Question 4 Swifty Corporation began the year with 9 units of marine floats at a cost of $10 each. During the year, it made the following purchases: May 5, 26 unit at $16; July 16, 17 units at $21; and December 7, 22 units at $23. Assume there are 30 units on hand at the end of the period. Swifty uses the periodic approach. (a) (b) (c1) (c2) Determine the cost of goods sold under average-cost. Average-Cost Cost of good sold $