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.$)$

$\backslash$table$[[,$Company A$,$Company B$,$Company C$],[$Sales$,$$$,9,000,000,,$$$,7,000,000,,$$$,4,500,000,],[$Net $$perating income,,,,$$,280,000,,,,],[$Average operating assets,$$,3,000,000,,,,,$$$,1,800,000,],[$Return on investment $($ROI$),,18,\%,,14,\%,,,\%$