G 2016 financial statement information, below to answer the following (figures presented in millions): Total Revenues: $20,425 Net Income: $2,244 Total Assets, Beginning of Year: $21,312 Total Assets, End of Year: $23,286 Equity, End of Year: $8,441 A. Calculate Southwest Airlines’ return on assets (ROA) for the year ending December 31, 2016. B. Disaggregate Southwest Airlines’ ROA into profit margin (PM) and asset turnover (AT). Explain what each ratio measures.