Manpower/Cost Ratio between PMC and EPCC Contractor

Hi Guys,

PMC : Project Management Consultant
EPCC Contractor : Engineering, Procurement, Construction and Commissioning Contractor.

What is the optimum ratio of manpower/cost between the PMC and the EPCC Contractor?

Let say the total project cost(TPC) is USD 100 million. What will be the typical cost for the PMC? 5%, 10%, 15% of TPC?

Thanks

norzul