Setting file permissions for Plugin installations

I need to set the correct permissions for installing

A: WP Super Cache

and

B: WP Database Backup

Does anyone know the numerical values required, and for which folders / files they are required for?

I know a lot of people have been through this so I hope you can help.

Reading http://codex.wordpress.org/Changing_File_Permissions has helped me understand the issue, but doesn’t tell me what to do in this instance.

THanks in advance for the help.