Marigold Corp. began the year with 9 units of marine floats at a cost of $12 each. During the year, it made the following purchases: May 5, 35 unit at $17; July 16, 18 units at $20; and December 7, 23 units at $24. Assume there are 31 units on hand at the end of the period. Marigold uses the periodic approach.

Determine the cost of goods sold under FIFO= $903

Determine the cost of goods sold under LIFO= $1133

Calculate average unit cost.(Round answer to 2 decimal places, e.g.5.12.)

Your answer is incorrect 18.25.

Please help i am stuck.