Examine Round Rocks assets.

1. What is Round Rocks largest category of assets? List all 2011 assets in the largest category and their amounts as reported by Round Rock.
2. What was Round Rocks cost of property and equipment at May 31, 2011? What was the book value of property and equipment on this date? Why is book value less thancost?

Round Rock Corporation Consolidated Balance Sheets (Partial, Adapted) May 31, (In millions) 2011 2010 1 Assets 2 Current assets 3 Cash and cash equivalents 4 Receivables, less allowances of $144 and $125... 5 Spare parts, supplies, and fuel S 2,098 246 2.772 2,610 4,510 411 4,670 468 10,008 6 Prepaid expenses and other 7 Total current assets 8 Property and equipment, at cost 9 Aircraft 10 Package handling and ground support equipment.1 11 Computer and electronic equipment 12 Vehicles 13 Facilities and other 14 Total cost 15 Less: Accumulated depreciation 16 Net property and equipment 17 Other long term assets 18 Goodwill 19 Prepaid pension 20 Intangible and other assets 2 Tal other long-term assets 22 Total assets 7,777 2,394 12,225 12,139 28,165 26,115 453 1435 1,594 44,805 42,695 2,394 586 14,903 (12,942) 29,902 29,753 724 1,275 329 2,328 42,299 39,858 724 1,341 324 2,389