If this is an older property (1950s or older) then it may be on clay sewer pipe which is prone to crack over time ... also if there are mature trees or vines out front, those roots have a way of finding nutrient sources, and sewage is excellent fertilizer ... so a small leak can turn into a big problem if filled and expanded with roots.

because if I use the 50% rule ( i know, it only for quick looks) or I use my excel sheet.

I wish you the best in your future endeavors, sounds like you're in an excellent location and off to a great start.

Doing a "Goal Seek" operation in Excel can get you to a price that makes sense for your business model.

@Dahl Brandon I hard some good things about Michael Blank's excel. 

As Ronald mentioned, keep up the excellent work.

Then import them to Excel and do a double search for flips.

That is an excellent idea.

She is an experienced realestate investor and a excellent broker. 

By the way, can i get yo handyman's digits?