Fair rates using friend for Private Money Lending (with xlsx)

[Christian Smith]

I have a friend who is interested in funding my flip. I'm working at figuring out what's fair for both of us but it's making my head hurt. I keep coming up with him only getting like a 6-8% return on his money which seems low but maybe i'm doing something wrong. Can someone please look at my spreadsheet and see what I have wrong. I threw in guestimate numbers so don't judge the flip numbers. Just the percentages and such. Thanks! 

https://docs.google.com/spread...