Good afternoon, I want to add for the application a semblance of a calculator for the user.

help to understand why the formula does not work =IF([Км]<4,DECIMAL(“7,77”),IF([Км]=4,DECIMAL(“6,23”),if([Км]=5,DECIMAL(“5,41”),if([Км]=6,DECIMAL(“4,58”),if([Км]=7,DECIMAL(“4,03”),if([Км]=8,DECIMAL(“3,76”),if([Км]=9,DECIMAL(“3,48”),if([Км]=10,DECIMAL(“3,26”),if(and([Км]>10,[Км]<21)=true,DECIMAL(“3,04”),if(and([Км]>20,[Км]<31)=true,DECIMAL(“2,44”),if(and([Км]>30,[Км]<41)=true,DECIMAL(“2,11”),if(and([Км]>40,[Км]<61)=true,DECIMAL(“1,94”),DECIMAL(“1,83”))))))))))))), where I made a mistake?

column type DECIMAL.