I really need help completing and understanding this problem. Very much appreciated.

Salmone Company reported the following purchases and sales for its only product. Salmone uses a perpetual inventory system. Determine the cost assigned to cost of goods sold using LIFO. Units Sold at Retail Date May 1 5 10 Units Acquired at Cost 200 units @ $15 245 units @ $17 Activities Beginning Inventory Purchase Sales Purchase Sales 165 units @ $25 15 125 units @ $18 24 115 units @ $26 Multiple Choice $5,055 $4,360 $4,960 $4,875 $4,540