Comparative data on three companies in the same service industry are given below.

Required:

$2.$ Fill in the missing information.

Note: Round the "Turnover" and "ROI" answers to $2$ decimal places.

$\backslash$table$[[,$Company$],[,$A$,$B$,$C$],[$Sales$,$$$,3,408,000,,$$$,1,335,000,,,,],[$Net operating income,$$,681,600,,$$$,146,850,,,,],[$Average operating assets,$$,2,130,000,,,,,$$$,3,290,000,],[$Margin$,,,\%,,,\%,,7,\%$