=IF(A1="","N/A",IF(A1<0.2,"E",IF(A1<0.4,"D",IF(A1<0.6,"C",IF(A1 <0.8,"B",IF(A1<1,"A","ERROR"))))))

You can change the percentages, the letters or nest up to 2 more IF
formulas.

Saludos

NlCO


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