During July, the following purchases and sales were made by Big Dan Company. There was no beginning inventory. Big Dan Company uses a perpetual inventory system. Sales 25 units July 3 11 20 Purchases 20 units @ $12 20 units @ $13 10 units @ $15 July 13 22 10 units Under the FIFO method, the cost of goods sold for each sale is: July 13 a. $300 b. 305 C 325 d. 375 Ob Od July 22 $120 130 130 150