The following information is provided by Digitrex Co. for the month of September: 10 Date 11 September 1 18 Total 25 Beginning inventory Purchase Purchase Units 300 410 420 1,130 Unit Cost $20 27 27 $74 Digitrex sold 390 units in September. Calculate the cost of goods sold and the cost of ending inventory for the month of September using the first-in, first-out (FIFO) method. a. Cost of goods sold is $7,916, and ending inventory is $21,638. b. Cost of goods sold is $6,382, and ending inventory is $26,633. c. Cost of goods sold is $8,430, and ending inventory is $19,980. d. Cost of goods sold is $5,361, and ending inventory is $16,643.