Crystal Reports How to get the last record running total in crysta

Message

     Hi, 

In crystal i need to calculate percentage . For that i need to get the running that appears in the last record.

For Eg:

Running total will be displayed like based on grouping

Group Total 10

Group Total 11

Group Total 12

I want to get the 3 running total i.e total to calculate percentage.

Data sample:

Name       Subjects    Marks  Percentage 

    John         English      100 
                     Maths        50
                     Science      50    
     Total A      200                (Total A/ Total A + Total B) * 100
    @total=200

     Klin           English      50 
                     Maths        50
                     Science      50

                     Total  B        150   (Total B/ Total A + Total B) * 100
     @total=350

I need to get 350 to calculate percentage.

Please suggest some idea or formula to apply 

thanks in advance

Edited by Jancy - 27 Jul 2010 at 1:40am