Please help me with the following question. I can't seem to find the correct answer. Any guidance will be helpful.

Lincoln Co. converted from the conventional retail method to the LIFO retail method on January 1, 2020, and is now considering converting to the dollar-value LIFO inventory method. During your examination of the financial statements for the year ended December 31, 2021, management requested that you furnish a summary showing certain computations of inventory cost for the past 3 years.

Here is the available information.

1.The inventory at January 1, 2019, had a retail value of $55,500and cost of $29,500based on the conventional retail method.

2.Transactions during 2019 were as follows.