On October 1, Saad Co. sold merchandise in the amount of SAR 5,800 to Neom Co., with credit terms of 2/10, n/30. The cost of the items sold is SAR 4,000. Saad Co. uses the perpetual inventory system. On October 4, Neom Co. returns some of the merchandise. The selling price of the merchandise is SAR 1,500, and the cost of the merchandise returned is SAR 1,050.

Record the entry or entries that Saad Co. must make on October 4^th.