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Try,
=IF(H15="","",IF(H15<=4,"0-4MWh=10%",IF(H15<=15,"4-15MWh=12%",IF(H15<=30,"15-30MWh=14%",IF(H15<=50,"30-50MWh=6%",IF(H15<100,"50-100MWh=18%","<out of range>"))))))
... since an IF statement is processed proressively, there is no need to stategreater than 4 and less than or equal to 15. If you needed two criteria for another application, then,
=IF(H15="","",IF(H15<=4,"0-4MWh=10%",IF(AND(H15>4,H15<=15),"4-15MWh=12%",IF(AND(H15>15,H15<=30),"15-30MWh=14%",IF(AND(H15>30,H15<=50),"30-50MWh=6%",IF(AND(H15>50,H15<100),"50-100MWh=18%"))))))
I also added a condition to do nothing if H15 is blank.
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