How Does OPM Investing Work?

[Yousuf Kaleem]

I am trying to get a better understand of how using OPM works in RE financing.  Specifically, how would you determine how much an investor gets after a flip, or cash flow for rental income?  Here are two examples. I am aware there are other costs to think about, but just keeping the numbers simple for the purpose of understanding.  

1) Flip:  Say purchase price and rehab costs on a home is 300k, and you flipped for 450k.  You put a down payment of 20% (60k) and got 120k each from two investors.  So since your net profit was 150k, how much would each investor get and how much would I keep?  Or is this a horrible investment because the net profit doesn't even equal the OPM I used?  

2) Rental: Same purchase price of $300k.  Used 240k OPM split evenly between two investors.  Rental cash flow is $500/month.  How much would each investor get, how much would I keep?   

I hope this makes sense.  Really trying to understand how I would pitch these kinds of investments to potential private lenders...