This will simplify your record keeping.

I will try the best I can to simplify the problem here there is a lot of moving parts.I currently have access to one hundred thousand cash to invest conservatively.

So if someone could please simplify..

Pulling all the good sub2 stuff together into one place like that would enable all of those tough searches to be simplified into "just hit that sweet page with everything good".

Jon has a simplified approach that is consistent given the variables as he has pointed out.

Otherwise, your property's making money, but you're working for free.So, you can simplify your formula for a first cut estimate.Price = (Gross Rent * 50%) / desired cap rateWith your examplePrice = (51,600 * 50%) / 7% = $368,571This property probably still loses money.

I'm only human :) There are just so many new investors making decisions to buy without fully thinking things through and I've seen that end very badly when market conditions change.For the record, I like the way @Chris Seveney simplified the structure.  

Typically cash simplifies the entire process tenfold.

I'm simplifying things a bit here so let me know if this doesn't make sense.EDIT: I realized I didn't answer your EDIT questions.

Lets say each house rents for $1,500 a month and we'll use the 50% rule for expenses to simplify things.Lets assume your mortgages are 30 years at 4.75%... your P&I payment would be $391.24 on the $75,000 you mortgaged (25% down payment).With 50% expenses, you're left with $750 a month on each of your 10 properties, paying $391.24 leaving NOI at $358.76 * 10 properties = $3,587.60 * 12 months = $43,051.20 (pretty hefty return on your $250,000 investment of 17.2% annually).Or you buy 2 properties in cash leaving $50k in reserve.