7,401 Interpreting and Applying Disclosures on Property and Equipment Following are selected disclosures from the 10-K report of Facebook Inc. Facebook reported 2018 sales of $55,838 million. Property and Equipment, Net December 31, $ millions 2018 2017 Land $899 $798 Buildings 4,909 Leasehold improvements 1,841 959 Network equipment 13,017 7,998 Computer software, office equipment and other 1,187 681 Construction in progress 7,228 2,992 Total 31,573 18,337 Less: Accumulated depreciation (6,890) (4,616) Property and equipment, net $24,683 $13,721 Depreciation expense on property and equipment was $3.68 billion and $2.33 billion during 2018 and 2017, respectively. (a) Compute the PPE turnover for 2018. Round answer to one decimal place. 2.9 (b) Estimate the useful life, on average, for its depreciable PPE assets. Round your answer to one decimal place. 8.6 x years (c) By what percentage are Facebook's assets "used up" at year-end 2018? Round your answer to one decimal place. 21.8 X %