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 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. (b) Estimate the useful life, on average, for its depreciable PPE assets. Round your answer to one decimal place. years (c) By what percentage are Facebook's assets "used up" at year-end 2018 ? Round your answer to one decimal place. %