Please help me with this accounting question?

Find the copy of the 10-K for: Cooper Tire & Rubber Company (CTB) filed Feb. 25, 2013
Gardner Denver, Inc. (GDI) filed Feb. 27, 2013
Ingersoll-Rand, PLC (IR) filed Feb. 14, 2013
Deere & Co (DE) filed Dec. 17, 2012

To compare inventories containing any LIFO values to a competitor’s inventory, an adjustment must be made to approximate current cost. Identify the total book value of inventories for all 3 companies at year end. Determine the dollar value of inventory that would be used to compare to a competitor’s inventory on Dec. 31, 2011 (use Oct. 31, 2011 for DE).

I have been asked to find the Balance Sheet Value, adjustment value, and Value used for comparison purposes. I looked up every 10-K files and have no idea on how to calculate the adjustment value and value used for comparison purposes for each ones. Anyone can please help me with that, I do appreciate it. Thank you.