Ace Systems, Inc. uses a perpetual inventory system. The companys beginning inventory of a particular product and its purchases during the month of January were as follows: Quantity Unit Cost Total Cost Beginning inventory (Jan. 1)..................... 10 $27.50 $275 Purchase (Jan. 15)...................................... 15 $28.00 $420 Purchase (Jan. 23)...................................... _5 $29.00 $145 Total...................................................... 30 $840 On January 28, Ace Systems sells 18 units of this product. The other 12 units remain in inventory at January 31. Assuming that Ace Systems uses the FIFO cost flow assumption, the cost of goods sold to be recorded at January 28 is:

$363

$499

$504

$336