What is the Standard Contractor Profit in Rehab?

[Jon Elson]

How much does your contractor usually charge on top of his (or her) subs to manage a rehab job?  I am working with my first contractor, the prices he's getting from his subs are very reasonable, but he's charging 10% for overhead and 20% for profit over and above the sub costs.  Does anyone know if a 30% mark-up is standard operating procedure?