renewing next term contract

I accepted a 6 month contract for a rate 15 % lower then the posted.  Now it's about time to renew the contract as the client wanted me to stay longer.  What is best strategy to ask a higher rate, at least 15% or more?  

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• 等~~~~ -xiaoxiao2013- ♀ (0 bytes) () 10/09/2014 postreply 19:46:30

• I mean negotiation with my agent, as it’s his client wanted me t -Avista- ♀ (0 bytes) () 10/10/2014 postreply 06:35:45