Use the following information on three companies to answer the question below.

Company Information

$\backslash$table$[[,$XX$,$YY$,$ZZ$],[$Total assets,$50,000,150,000,250,000],[$Total liabilities,$30,000,80,000,130,000],[$Total stockholders' equity,$20,000,70,000,120,000],[$Sales$,95,000,295,000,500,000],[$Variable costs,$25,{000}_{?},115,{000}_{?},250,000$