This stuff is the most confusing concept to me regarding my accounting class. I hope someone is able to understand this better than me and if you have advice for me feel free to share it. Thank you.

LIFO perpetual inventory The beginning inventory at Dunne Co. and data on purchases and sales for a three-month period are as follows: Required: enter the units with the HIGHER unit cost first in the Cost of Goods Sold Unit Cost column and LOWER unit cost first in the Inventory Unit Cost column. Schedule of Cost of Goods Sold LIFO Method For the Three Months Ended June 30 Apr: 30 May 8 40056,000 May 10 May 19 May 28 140 440 61,600 140 61,600 June 5 June 16 June 21 252 480 120,960 June 28 June 30 Balances 2. Determine the total sales, the total cost of goods sold, and the gross profit from sales for the period. Total sales $ Total cost of goods sold Gross profit