calculate percentage

I have a report in which there is a column callled "Login Status".The values in the Login Status column can be 'Available','Successful' and 'Error'.
I am able to get the count for each options.
For example i have a table that has 10 rows.
I am able to get number of rows that have Login Status ="Available" and so on.I am getting this using Running Total Fields.
Now i want to calculate the percentage of each options.
For example there are 10 rows.
Available count=5
Successful count=3
Error=2
So Available Percent=Available Count*100/Total.
How can i achieve this calculation?
i am placing all Running Total Field in report footer
Thank you very much in advance
Regards
JigneshAdd a formula for each porcentage calculation and place them in report footer section

To get the total of records You can use the function RecordCount|||Also, read up on the PercentOf functions, which may be useful if you are grouping on status.sql