The subsequent is a record of Tiller Corporation's inventory transactions for current month:
January 1 Balance, 500 units @ $10 each January 5 Sale, 290 units @ $25
January 11 Purchase, 300 units @ $12 each January 13 Sale, 250 units @ $25
January 23 Purchase, 400 units @ $13 each January 27 Sale, 310 units @ $25
Tiller uses the periodic inventory system. Using weighted-average inventory method, Evaluate cost of goods sold for the month of January?