The property and equipment section of the Abbott Laboratories 2012 balance sheet follows.

The company also provides the following disclosure relating to the useful lives of its depreciable assets.

During 2012, the company reported \(\$ 1,363,673\) (\$000s) for depreciation expense.
Required

a. Compute the estimated useful life of Abbott Laboratories' depreciable assets. How does this compare with its useful lives footnote disclosure above?

b. Compute the estimated percent used up of Abbott Laboratories' depreciable assets. How do you interpret this figure?
Rohm and Haas Company (ROH)

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Property and equipment, at cost ($ thousands) Land. Buildings. Equipment Construction in progress Less: accumulated depreciation and amortization Net property and equipment .... .. December 31 2011 2012 $ 604,462 $ 633,917 $648,988 4,259,240 4,467,387 4,334,236 13,110,833 12,216,388 11,813,618 577,460 954,352 698,873 2010 18,928,887 18,016,565 17,374,302 10,865,840 10,142,610 9,403,346 $8,063,047 $ 7,873,955 $ 7,970,956