How to split profits in a house flip between partners

[Margie Brooke]

A friend and I are flipping two houses. 100% of the funds for both purchase (paid cash, no mortgage) and the labor and materials are mine. I pay for the staging furniture. The bulk of the labor is done by subs, however we also contribute, make all the style decisions, running around, landscape design etc. The car, truck, etc that we use are mine. What is a fair formula?  We'd like to continue to do one or two houses at a time.