I'm seeing various % for both and would like to ensure the math is correct.

Getting the math right is crucial to making a successful deal. 

I don't disagree with the math, but there are some large assumptions baked into the original post. 

He hadn't done his homework!!

The math works really well if you are savy. 

., Excel ability, was a Math major in school)Developing efficient, scalable business processes and getting creative with incentive alignment to ensure everyone is working toward the same goalA deep belief that conscientiousness, integrity, and a genuine interest in and appreciation for everyone's personal goals is the only way to have a team firing on all cylindersImmediate Next Steps: Find a lender to get pre-approvedTake a drive around the area with an expert to learn the ins & outs, and begin churn through deal analysis in the neighborhoods most applicable to meAssemble a team so I can move quickly when the right deal presents itselfI’d be thrilled to receive any help or guidance with regards to the above next steps, or just meet anyone active in the area!

Being in the mountain region the cabins rent from April - November and are winterized (or owner used).If my math is correct, not including any required state income taxes, the return would be approximately 9.5-12% annually (after state income tax 7.5-9.5%).Does this seem like a worthy investment?

Sounds like you really did your homework on this one and had multiple options! 

I would be more focused on questions like these than what math formula to use to value it.

Quick answer......zillow; har; last but not least.....knowing the area, if you've REALLY done your home work, you should know just by LOOKING at a house how much you're going to offer.