Companies in the coal mining business use a lot of property, plant, and equipment. Not only is there the significant investment they must make in the equipment used to extract and process the coal, but they must also purchase the rights to the coal reserves themselves. Goodyear Tire & Rubber Company, Inc. is the largest tire manufacturer in North America. Cloud Peak Energy Corporation claims to be the largest private-sector coal company in the world. The following information was taken from these companies December 31, 2012, annual reports. All dollar amounts are in millions. Cloud Peak Energy, Inc. Goodyear Tire Sales $2,060 $24,514 Depreciation and depletion costs 99 613 Property, plant, and equipment (net of accumulated depreciation) 1,913 7,198 Total assets 2,781 23,072 Depreciation method Straight-line or units of production Straight-line Estimated life of assets: Buildings 5 to 25 years 5 to 45 years Machinery and equipment 3 to 20 years 3 to 30 years Calculate depreciation costs as a percentage of sales for each company. (Round your answers to 2 decimal places (i.e., 0.0123 should be entered as 1.23).) Calculate buildings, property, plant, and equipment as a percentage of total assets for each company. (Round your answers to 2 decimal places (i.e., 0.0123 should be entered as 1.23).)