The 2013 financial statements for Leggett & Platt, Inc. report the following information:

Year ended December 31,	2013	2012
(In millions)
Depreciation and amortization expense	$ 90.1	$ 90.4
Property and equipment, net	574.6	572.8
Land	44.5	45.3
Accumulated depreciation and amortization	1,266.6	1,237.4

a. By what percentage are the assets used up at the year-end 2013? What implication does this ratio have for future cash flows at Leggett & Platt?

b. Estimate the useful life on average for the Leggett & Platt depreciable assets.