A company purchased 90 units for $20 each on January 31. It purchased 200 units for $30 each on February 28. It sold 200 units for $70 each from March 1 through December 31. If the company uses the first - in, first-out inventory costing method, what is the amount of Cost of Goods Sold on the income statement for the year ending Decomber 312 (Assume that the company Usos a porpetual inventory system) O A $5,100 OB. $1,800 OC. $6,000 OD$7.800