How to split up this scenario between investors/partners?

[Omar Ghanim]

In my rehab flip business I find/make the deal, I make the decisions and help on the whole rehab project, I close the deal..

My friends/partners want to invest with me and they will be taking a share of the profits depending on how much money they put in.

example: purchase price=420k   rehab,closing,etc=60k   sold=570   (90k profit)

Im the brains and keep up with the whole deal as stated above and I put in 80k on the project

one partner put in 200k  

the other put in 200k        

How will the profits be split fairly? Or what is a good formula for this? Thank you!