Required information (The following information applies to the questions displayed below) Singleton Company's perpetual inventory records included the following information: Date January 1 March 4 September 28 Beginning inventory Purchase Purchase Number of units and unit cost Total cost 320 units @ $13 $4,160 270 units @ $20 $5,400 590 units @ $15 $8,850 Number of units sold during the year: 880 If Singleton uses the LIFO cost flow method, its ending inventory would be $3,900