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 and other amounts to whole dollars.$)$

$\backslash$table$[[,,,,,$ompany,,,,$],[,,$A$,,,$B$,,,$C$,],[$Sales$,$$$,380,000,,$$$,730,000,,$$$,570,000,],[$Net operating income,$$,33,810,,$$$,54,000,,,,],[$Average operating assets,$$,161,000,,,,,$$$,155,000,],[$Return on investment $($ROI$),,21,\%,,17,\%,,,\%$