The following data was extracted from the records of Winsam Company: Winsam's most recent income statement showed cost of goods sold of $2,250. Which method was used for valuing inventory? Sales revenue 150 units @ $25 per unit Purchases 300 units @ $19 per unit Beginning inventory 200 units @ $15 per unit a. LIFO method O b. None is correct c. FIFO method O d. Average cost