I am just NOT understanding this :'(

Please help someone

Good Buy Unlimited made total purchases of 280,000 in the most current year. It paid freight in of $4500 on its purchases. Freight out (the cost to deliver the merchandise to its customers) totaled $9600. Of the total purchases, Good Buy Unlimited retured $29,000 of the merchandise. Good Buy Unlimited took advantage of $2300 of purchase discounts offered by its vendors. What was Good Buy Unlimiteds cost of inventory.