In january 2016, united airlines​ (ual) had a market capitalization of $ 20.57 ​billion, debt of $ 12.04 ​billion, and cash of $ 5.35 billion. united airlines had revenues of $ 39.68 billion. southwest airlines​ (luv) had a market capitalization of $ 27.62 ​billion, debt of $ 3.04 ​billion, cash of $ 3.16 ​billion, and revenues of $ 19.61 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.