@Ali AhmedYes there is a formula; you take the anticipated rent increase, in your example we will assume $500 for the math, and multiply by 12 (returns are always calculated annually); take that number and divide it by the cost of the project ($10,000) and you get your ROI (return on Investment).Formula is: annual increase / project cost = ROINow, you have to decide what return is worth it for you to undertake the project.

@Brady MullenIn real estate, debt is a multiplier of effectiveness.  

Multiply that by 100, and that's what I can afford to pay to buy and renovate the duplex.

Even in 1970 during high rate of inflations, the growth multiplier of RE is 3.x ; more than the average of 1.5%- If you compare to actual hyper-inflation in developing country, gozzz, this is nothing.

Ideally want to start out with 500 Direct Mailers every two weeks and some Bandit signs/Car Magnets.Not enough, you need to multiply those numbers by 10 and hire 20 people to call for you. 

I would just multiply that amount by the number of months that were late. 

If you are new to flipping, the good rule of thumb is whatever your renovation estimate is, multiply it by 2 and that's your real number.

I then take this multiple and multiply it by SQFT.

Get the fmv-repairs-8%closing cost then multiply by 75% to get what it's worth .

A few dozen rehabbers agreeing to focus on single blocks north + south of Fleet, would create a multiplier effect.Rehab properties block by block starting at I-77 and sweep east.