Hi and welcome to the forum
try this...
=IF(C4="","",IF(C4<=375,"100%",IF(C4<=405,"90%",IF(C4<=450,"80%",IF(C4<=475,"70%",IF(C4<=600,"50%",IF(C4>=601,"0%",0)))))))
But then you also need to adjust the formula in column F, but thai is protected, so it is not visible
Also, in your formula...
=IF(C4="","",IF(C4<=375,"100%",IF(
C4<=405,"90%",IF(C4<=450,"80%",IF(C4<=475,"70%",IF(C4<=600,"50%",IF(C4>=601,"0%",0)))))))
is 405 correct? it seems to not be in the same sequence as the other values, maybe it should be 400?
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