Assuming you have a field called “Result”, create a formula field with this as the formula:

IF(
  {Result} >= 80,
  "Go",
  IF(
    {Result} >= 50,
    "Caution",
    "Run"
  )
)

If you don’t have a field called “Result” you can do the same thing with the source fields instead, something like this:

IF(
  SUM({Field 1},{Field 2}) >= 80,
  "Go",
  IF(
    SUM({Field 1},{Field 2}) >= 50,
    "Caution",
    "Run"
  )
)

Take a few minutes to read this, it’ll help sooooo much:

Thanks for the answer. But I’ve made that, and it didn’t worked. I’ve read the formula field reference, and the conditional formating reference, and it didn’t worked. =(

My mistake! I placed a space between the IF and the (

I’ve edited my previous answer and tested it:

Worked. Thanks =) Now I have the ultimate Airtable to use in my negotiations (I’ll know exacly, how much discount can I give, and how much everything will cost to me and to my clients). =)