I say it with pure humor and respect for math way over my head.

You certainly need to spend time learning how to check someone's math, don't necessarily take their word for it.

Although I couldn’t get the math to work on PCB condos without paying cash. 

I was doing the cash in/out math on the BRRR method manually to get a better idea of how it's all calculated.

If my math is correct we had till Aug 26 and or Oct 1 (if we did not count weekends) The owner sold the home for Half of the price and the new Owner showed up today 7/17 telling me i had to move by THIS SUNDAY ...I have invested alot of heart and soul in cleansing the home inside and out and have made this our family home .

If my low ball offer is accepted, and I end up spending a total of $5-7,000 (adding in extra for labor and any surprises)  on repairs, with an estimated monthly income of $650-700 in rent, and yearly taxes at around $1,000 I'm estimating I could make a pretty decent profit, according to my math it would pay itself off in less than 3 years.

I’m trying to figure out the math regarding buying power.

It’s just a simple math problem as to who owes what.

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My first BRR. I get a D on reconciling contractors’ conflicting estimates and invoices with budget.

So, you have to run your math based on the current rent.It is not hard to find good tenants for multifamily buildings.