Realtor percentage fee structure

[Richie Martin]

Whats is a going rate for a realtor to represent you on a purchase and whats a normal percentage fee structure?

On a purchase whats the avg percentage fee structure? 

Is it safe to say a realtors job to give you all in on a sale or give you or prices each level of sale with a fee?

I thought on a purchase 1% if the realto can negotiate the seller to pay the 2% commission and 3% commission for selling your proerty?