Windsor, Inc. began the year with 12 units of marine floats at a cost of $10 each. During the year, it made the following purchases: May 5, 29 unit at $15; July 16, 15 units at $21; and December 7, 20 units at $23. Assume there are 24 units on hand at the end of the period. Windsor uses the periodic approach.

Determine the cost of goods sold under average-cost.

COGS FIFO = 786

COGS LIFO = 1030

Average Unit Cost = 910

Need help with the last one please

Thank you :)