In January 2019, United Airlines (UAL) had a market capitalization of $22.98 billion, debt of $13.47 billion, and cash of $4.02 billion. United Airlines had revenues of $41.34 billion. Southwest Airlines (LUV) had a market capitalization of $27.31 billion, debt of $3.21 billion, cash of $3.79 billion, and revenues of $21.92 billion. a. Compare the market capitalization-to-revenue ratio (also called the price-to-sales ratio) for United Airlines and Southwest Airlines. b. Compare the enterprise value-to-revenue ratio for United Airlines and Southwest Airlines. c. Which of these comparisons is more meaningful? Explain