Gross billings for merchandise sold by X Company to its customers last year amounted to $12,720,000; sales returns and allowances were $370,000, sales discounts were $175,000, and freight-out was $140,000. Net sales last year for Lang Company were O a. $12,035,000 O b. $12,720,000 O c. $12,350,000 d. $12,175,000