What are considered to be fair percentages to be paid on private money?

[Jay Lancaster]

I'm working with a partner in an effort to acquire 8 properties to buy, fix and hold. When the same private lender is providing the funds for property acquisition and the estimated 3 to 4 months rehab costs what are the "customary" (If there is such a thing) percentages that would or should a person try to negotiate on repayment from an immediate cash out Refi? Should the Acquisition loan repayment be separate from the rehab loan?