One other way, arrange your table as follow in a far away location
and hide it if you want on the spreadsheet and use this formula

=IF(ISNA(VLOOKUP(C2,A2:B5,2,1)),"D",VLOOKUP(C2,A2: B5,2,1))

Grade score
89 D
90 C
95 B
98 A

Change the references according to yours
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Hope this is helpful

Pls click the Yes button below if this post provide answer you have asked

Thank You

cheers, francis

Am not a greek but an ordinary user trying to assist another



"dchristo" wrote:

I need a formula for
if 100 - 98 = A
97 - 95 = B
94 - 90 = C
90 = D

Thank you for you help.