The Hertz Global Holdings, Inc. case article by Christopher Noe, Lauren Pully, and Cate Reavis deals with restatement of results, changes in estimates, depreciation and how changes in depreciation impact the company's profitability. What percentage of its revenue earning equipment does Hertz depreciate each year? Do the changes in the depreciation of Hertz's revenue earning equipment materially affect the company's profitability? What are some of the potential reasons to explain the changes in Hertz's depreciation of its revenue earning equipment