Can I ask what is your rent agent fee now?
Unfortunately from my experience this a wrong question to ask. You see every state, every manager, they charge differently.
Some can have lower mgmt. fee yet add additional advertising, or letting fee, or database fee etc...
Recently, I calculated that around 10% will be the total cost for the IP in Sydney, though premium area. Others charged 13% when I added the total fees, and most agents (sorry) did not provide the flexibility for the tenant or the landlord.
I actually had to produce a spread sheet trying to understand the total fee structure and interview about 5 agents, after research. In the end I crossed and changed heaps on the Management Agreement and went with the one that provided most flexibility and other factors of importance to me.
I think this is a negotiation process in itself, finding the right agent to manage, being fair not cheap, yet flexible and reasonable too.
Also, I ask heaps of questions based on my previous experience with other agents.