
Answer:
The ending inventory by using the gross method in order to record purchases amounts to $313,680. Hence, the correct option is A
Explanation:
Net Purchases = Gross Purchases - Purchase returns - Purchase discount
             = $600,000 - $4,500 - [($600,000 - $4,500) × 4%]
             = $595,500 - $23,820
             = $571,680
Purchases = Net Purchases + Freight inward
         = $571,680 + $9,000
         = $580,680
The ending inventory will be computed as:
COGS (Cost of goods sold) = Beginning inventory + Purchases - Ending inventory
        $370,000  =  $103,000 + $580,680 - Ending inventory
Ending inventory = $683,680 - $370,000
               = $313,680