DuPont reported depreciation expense of $1,466 million on its consolidated financial statements for the period envded December

Question:

DuPont reported depreciation expense of $1,466 million on its consolidated for the period envded December 31, 2015. The following excerpt is taken from the company's consolidated for the same year:
(Dollars in millions, except per share) December 31, 2015
Property, Plant and Equipment......................................$24,130
Less: Accumulated depreciation......................................14,346
Net property, plant, and equipment....................................9,784
Analyze:
1. What percentage of the original cost of property, plant, and equipment was depreciated during 2015?
2. What percentage of property, plant, and equipment cost was depreciated as of December 31, 2015?
3. If the company continued to record depreciation expense at this level each year, how many years remain until all assets would be fully depreciated? (Assume no s.)
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