Formula Fields
Return Type is Number, 0 decimal Places
NPS Promoter:  IF( NPS_Score__c > 8, 1, 0)
NPS Passive: IF(AND( NPS_Score__c > 6, NPS_Score__c < 9), 1, 0)
NPS Detractor: IF(NPS_Score__c < 7, 1, 0)

NPS Calculation Report Summary Formula
Output Type: Number, 0 Decimal Places

(Contact.NPS_Promoter__c:SUM/RowCount*100)-(Contact.NPS_Detractor__c:SUM/RowCount*100)



