Lending rate for friend's flip

[Corey M.]

I've helped fund a friend's previous flips. He usually gets a hard money loan, but still needs bridge financing for the down and monthly payments. I've previously charged him between 7-8% interest, but that was over a year ago. His hard money loan is at 10% interest and 250k down. What is the appropriate interest rate for me to charge him? 15%?