What's your favorite "formula" when finding a deal?

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In my research I've come across several different formulas people use to determine if a deal is worth the risk. The 70% rule [i]seems to be the most used and discussed (?).

While at a workshop recently I met someone who uses this formula:

Figure out ARV.

Deduct 10% of ARV for rehab costs.

Deduct 8% of ARV for all closing costs (including hard money).

Deduct 15% of ARV, which is your target profit.

You're then left with the purchase price.

Does this look good to anyone? Regardless, I'd love to know what formulas work the best for you.