I did company charges $8.50 per ticket for people of all age groups if she represents the total number of children who buy tickets in a represents the total number of adult who brought tickets which expression best represents the total money earned by the company from the sale of the tickets

The expression that represents the total money earned by the company from the sale of the tickets is:

$8.50a + $8.50c

Where "a" represents the total number of adults who bought tickets and "c" represents the total number of children who bought tickets.