How to know, what to prize your house after rehab

[Quint Beniers]

HI there guys.

I'm looking at a 1803 sqft house with 3/2 from 1979

Need new roof and Air condition unit, and doing full rehab inside

But how do I know what's the right prize to list after i'm done

I know you need to check out the comps in the neighborhood from last 6 months.

My realtor send me this email with comps in the neighborhood. but there some much difference between them in prize. this what she send me. must say house i'm looking at has more sqft then almost all of them, but also is the olderst from all of them.

List $89.900 Sold $82.000 year 1987 sqft 1691

List $72.500 Sold $62.000 Year 1990 sqft 1552

List $74.900 Sold $70.000 Year 1984 sqft1542

List $65.000 Sold $62.000 Year 1989 sqft1650

List $88.300 Sold $88.300 Year 1987 sqft1741

Current listing $74.900 Year 1988 sqft1692

Current listing $76.000 Year1985 sqft1975

Is there a formula you guys use, or just go from comps in neighborhood? 

Thanks Quint