Find average at group level of multiple grouped fields

Question

Can this not be done in Crystal
I am trying to total and average at the group level like this:
((Sum ({@Unscheduled}, {@monthName}))/(Sum ({@total}, {@monthName}))*100)
--  {@Unscheduled} =           if ({Table_Name.status} = "Unscheduled" and not({Table_Name.StartDate}>= currentdate))
then 1
I am grouping by month. The formula {@Unscheduled} gave me the total for each month of that ticket type and I was able to sum 3 other ticket types and sum total of all ticket types. But when I try to find the average of each with this
((Sum ({@Unscheduled}, {@monthName}))/(Sum ({@total}, {@monthName}))*100)
I get an error saying division canu2019t be done with zero, but there are no zeros  when shown separately on the report.
I guess my question is Can you not perform calculations at the group level with multiple fields.
Any insight would be appreciated and I apologize if this is somewhat incoherent.

Answer 1

You could do this like this, I think:
If Sum ({@total}, {@monthName}) = 0 Then
    0
Else
    Sum ({@Unscheduled}, {@monthName}) / Sum ({@total}, {@monthName}) * 100;