Thanks for your help Tom and Trevor.

The second formula works.

Interestingly the first formula -

=1*if(And(A1=1,A1<=3),.10,if(And(A1=4,A1<=7),.20 ,if(And(A1=8,A1<=10),.3,0
)))

Failed to work even though I wasn't using integers.

regards, Nik


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