Articleship extension period calculation- plz help

STUDENT (student) (267 Points)

05 August 2012  
I had taken 300 days leave for exams of CS & CA Final. And absent 26 days in whole 3 years of articleship period.
So for calculation of leave taken i applied the follwoing formula:-
 
Total leave taken - weekends & Public holidays during leave period + absent days
= 300 - 85 + 26
= 241 days.
 
Plz tell me friends whether it is correct method of calculation?
 
If i m wrong plz suggest me the correct method of calculation?
 
It is Urgent ........... 
 
Thanks in advance