The accounting records of Oots Electronics show the following data.

Beginning inventory	3,000 units at $5
Purchases	8,000 units at $7
Sales	9,200 units at $10

Determine cost of goods sold during the period under a periodic inventory system using (a) the FIFO method, (b) the LIFO method, and (c) the average-cost method. (Round unit cost to nearest tenth of a cent.)