The accounting records of Cullumber Electronics show the following data.

Beginning inventory $3,000$ units at $$4$

Purchases $9,500$ units at $$6$

Sales $10,100$ units at $$9$

Determine cost of goods sold during the period under a periodic inventory system using the FIFO method, the LIFO method, and the average$-$cost method. $($Round answers to $0$ decimal places, e$.$g$.125.)$