need help plz

Sheffield's Market recorded the following events involving a recent purchase of inventory: Received goods for $81000, terms 2/8,n/30. Returned $1200 of the shipment for credit. Paid $600 freight on the shipment. Paid the invoice within the discount period. As a result of these events, the company's inventory increased by $78792. increased by $78204. increased by $78804. increased by $80400