This got me thinking and I did some math and found if I was a good landlord and kept my vacancies low then the return on the cash I had invested would way outperform any return I have ever made in stocks and IRA etc.

Plus the math wasn't going to work out nicely for you on the roof.  

I am a full time math teacher, own my own lawncare business that I spray about 500 customers lawns.  

While this only takes less than a second in my brain, when I have to do this with every letter in a word and every number it dramatically slows my reading and timed math test.

Changing your example a bit for easier math, let's say you bought a 100K balance note at 80K, so you bought it at 80% of UPB. 

Either he's bad at math, bad at figuring how long it will take to do a job, or bad at communicating with you (either way, not a good businessman).What happened to your "old" carpentry crew?

PLUS , you still cannot show how it is functional in any way since you have to have a SOLD price to do your simplistic math.  

I'm looking at a house across the street from the beach at Salisbury Beach MA. The

Can you explain with some actual numbers so I can see the math?  

Much lower than house 1.However   The problem with this math is that there is a good chance that 10 years form now that that house 1 in the rust belt is only worth 50k... or possibly 55k.