Try this...
C21=IF($C$18 >30001,20%,if($C$18>5000,20%,50%))
C22=IF($C$18 >30001,30%,if($C$18>5000,30%,50%))
C23=IF($C$18 >30001,30%,if($C$18>5000,50%,""))
C24=IF($C$18 >30001,20%,if($C$18>5000,"",50%))
You may need to work with the tow "" options if you need to apply % to values elsewhere
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