Northwest Fur Co. started 2013 with $100,000 of merchandise inventory on hand. During 2013, $450,000 in merchandise was purchased on account with credit terms of 2/15, n/45. All discounts were taken. Purchases were all made f.o.b. shipping point. Northwest paid freight charges of $7,800. Merchandise with an invoice amount of $4,800 was returned for credit. Cost of goods sold for the year was $373,000. Northwest uses a perpetual inventory system. Assuming Northwest uses the gross method to record purchases, what is the cost of goods available for sale?

$551,200.

$544,000.

$544,096.

$553,000.