@penelson

re:

=((Sum(Fields!field3.Value) / Sum(Fields!field1.Value) * 10 + Sum(Fields!field4.Value) / Sum(Fields!field1.Value) * 10 + Sum(Fields!field5.Value) / Sum(Fields!field1.Value) * 10 + Sum(Fields!field6.Value) / Sum(Fields!field1.Value) * 10) - (Sum(Fields!field7.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field8.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field9.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field10.Value) / Sum(Fields!field2.Value) * 10)) / (Sum(Fields!field7.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field8.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field9.Value) / Sum(Fields!field2.Value) * 10 + Sum(Fields!field10.Value) / Sum(Fields!field2.Value) * 10)

shouldn't the operand before Sum(Fileds!field7.Value) be a '+' sign?