Crystal Reports Count question

Message

   I am creating a new report that has to be sorted by department, seniority date and name. The incoming data will look similar as follows: 

Dept            Seniority Date             Name
100             1990/02/01               Test4
100             1984/10/01               Test2
100             1983/02/01               Test1
100             1985/01/02               Test3

200             1981/10/01               Test2
200             1979/02/01               Test1
200             1985/01/02               Test3

100             1985/03/02               Test11
100             1985/04/02               Test12

I will sort this report in Dept, Seniority Date and Name so it will look as follows: 
Dept            Seniority Date             Name
100             1983/02/01               Test1
100             1984/10/01               Test2
100             1985/01/02               Test3
100             1990/02/01               Test4
100             1985/03/02               Test11
100             1985/04/02               Test12
200             1979/02/01               Test1

200             1981/10/01               Test2
200             1985/01/02               Test3

I'd like to do a count of the employees by department and highlight the top 1/3 of people out of total employees within each department and put '*' beside them and print a message at dept break saying eg. "3 out of 6 have the highest seniority" in case dept 100 or "1 out of 3 have the highest seniority" etc.

The report should look as follows:

   Dept            Seniority Date             Name
* 100             1983/02/01               Test1
* 100             1984/10/01               Test2
* 100             1985/01/02               Test3
   100             1990/02/01               Test4
   100             1985/03/02               Test11
   100             1985/04/02               Test12
Department 100 3 out of 6 have the highest seniority

* 200             1979/02/01               Test1

   200             1981/10/01               Test2
   200             1985/01/02               Test3
Department 200 1 out of 3 have the highest seniority etc.

Is there a way to do this ?

Thanks in advance.