Peterson Company reported the following purchases and sales of its only product. Peterson uses a periodic inventory system. Determine the cost assigned to ending inventory using LIFO. Date Activities Units Acquired at Cost Units Sold at Retail May 1 Beginning Inventory 320 units @ $17 5 Purchase 305 units @ $19 10 Sales 225 units @ $27 15 Purchase 185 units @ $20 24 Sales 175 units @ $28