Help partnering deal for profit, in the st. Louis Market

[Beary Bowles]

I am a seasoned investor in the St. Louis Market and have a deal that's is currently on contact.  I would like to partner up with anyone with the property of 50% profit until refinance to pay back to my partner or my pay back on my partner's borrowed down payment amount and I will pay 10% interest on the borrowed amount until closing or refinance after the deal is closed to pay on the borrowed amount in full plus interest.  The reason I'm saying that is that I have a deal and the seller will not do seller fiancé and I'm partially short of an 20% down payment.  Any advise, or if anyone interested in this venture on a great deal and to make some short term interest growth on their borrowed money?