Subtract what you owe and what's left is yours.

So, in the event the sellers accept your offer for 75k, they are actually agreeing to sell their homes much less than 75k as the closing costs will be subtracted from the actual purchase price. 

those numbers are correct but you have to subtract for utilities.

I have been using the 50% rule and subtracting 5% to 10% if the majority of the large CapEx items are new like a roof and HVAC are recently replaced. 

My house is a 2/1 and has a one car garage attached, and a huge covered porch.According to J Scott's book on estimating ARV, I should subtract 3% for the bedroom, I assume the same amount for the bathroom and for the bigger garage.

To get an NOI you simply subtract yearly expenses from yearly income.

Let's assume 10% vacancy/year - subtract $3,600/yr from $36,000/yr = $32,400/yr or $2,700/mo income. 

Using the 70% rule as a general rule of thumb, then subtracting repair costs from that there is nothing even close that fits this criteria.

So it is seasoned and you resell it at 10% discount at $83,876 which is an additional $13,876 after subtracting your $70,000 investment. 

So i will be cash flowing at least close to $665, once you subtract the mortgage of $820 and monthly property management fee of $165.