On what profit margin does RPO work? different profit commission for different level of experience?

Can you please let me know on what profit margin does RPO works. Also let me know if some body have list of RPO in Bangalore.
Will there be different profit commission for different level of experience? please let me know how to increase the counts of clients.
Any other important tings related to RPO.plz let me know.

RPO has many advantages like
-Advatage of the cutting cost
-time saving
-RPO is nothing but an extra help for searching the talents
-Increased productivity
-Faster process