Lewis Company uses the gross method and a perpetual inventory system. Assuming the following entries, compute the amount that Lewis Company received on September 20 . September 10 Sold goods costing $4,800 to Thompson Company on account, \$8,000, terms 5/10, n/30. The goods are shipped FOB Shipping Point, Freight Prepaid by Seller, $400. September 16 Thompson Company returned undamaged merchandise previously purchased on account, $1,900. September 20 Received the amount due from Thompson Company. Amount due from Thompson Company on September 20