A family friend has asked your help in analyzing the operations of three anonymous companies operating in the same service sector industry. Supply the missing data in the table below: $($Loss amounts should be indicated by a minus sign. Round your percentage answers to nearest whole percent.$)$

$\backslash$table$[[,$Company$],[,$A$,$B$,$C$],[$Sales$,$$$,9,330,000,,$$$,7,550,000,,$$$,4,995,000,],[$Net operating income,,,,$$,317,000,,,,],[$Average operating assets,$$,3,110,000,,,,,$$$,1,998,000,],[$Return on investment $($ROI$),,18,\%,,10,\%,,,\%$