Cinnamon Buns Co. (CBC) started 2021 with $52,000 of merchandise on hand. During 2021, $280,000 in merchandise was purchased on account with credit terms of 2/10, n/30. All discounts were taken. Purchases were all made f.o.b. shipping point. CBC paid freight charges of $9,000. Merchandise with an invoice amount of $4,000 was returned for credit. Cost of goods sold for the year was $316,000. CBC uses a perpetual inventory system. What is cost of goods available for sale, assuming CBC uses the gross method?

A. 312480

B. 326000

C. 331480

D.337000