Answer : its cost of goods sold = $ 393,400

Working notes for the above answer

We have provided with the information as follow

Sands Company sold goods with a total selling price of $809,120 during the year.

It purchased goods for $384,900 and

had beginning inventory of $66,900.

A count of its ending inventory determined that goods on hand was $58,370.

cost of goods sold is calculated as follow

COGS = Opeaning Inventory + Purchase – Closing Inventory

= 66,900 +384,900 -58370

=$ 393,430