77. Checkers uses the periodic inventory system. For the current month, the beginning inventory consisted of 2,400 units that cost $12 each. During the month, the company made two purchases: 1,000 units at $13 each and 4,000 units at $13.50 each. Checkers also sold 4,300 units during the month. Using the average cost method, what is the amount of cost of goods sold for the month? A) $55,685. B) $57,900. C) D) $53,950. $55,900