I am planning on purchasing a property and I want to hold on to it for a few yrs,the market currently looks good but I wandering if there a formula or maybe something I should be looking at to determined if this area will grow in the next 5 yrs. 

Many people miss that last piece in the equation.With a stringent formula like that, you'll probably need to work with a wholesaler in the area.

Simple formula, but the mindframe HAS to STAY positive.  

I am going to share with you a simple 5 Part Formula of everything you need to do to get your "one deal per month" just like I told Rodrigo to do.  

Flip2freedom episode 77[http://www.flip2freedom.com/a-3-step-formula-to-a-successful-balanced-and-insanely-profitable-2012/] - podcast - LISTEN TO THIS TODAY!

The CUMPRINC formula that is used seems to just calculate the standard cumulative principal payment over time.

When doing the calculations on expenses the debt repayment portion is done based on 100% financing figures so that you are being paid a return on your equity at the same interest rate as the mortgage as part of the cash flow calculations.BP calculators may not use this formula but if you do not then your cash flow numbers are not accurate. 

The formula has been corrected in my other post.

I understand the formula used by most wholesalers is 70% ARV minus rehab minus your fee.......my question is when I am making an offer to the seller, for example100,000 arv15k repairs 10k feeWould my offer price to the seller be 55k and then I add the 10k in when I find a buyer and sell for 65k?

Is there a general formula to figure out what is the most I should ask from my end buyer to pay for this property if I hope to make a profit of appx $3-5k?