Crystal Reports math for subtotal totals

I am trying to calculate the percentage of two column totals in Crystal Reports.  The formula below is the formula I am trying to use:

If {Command.cost}= 0 then 0 else sum{Command.cost}/sum{@labor gross}*100

What am I doing wrong?

Thank for your help in advance.
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Assuming that is the formula you are missing ( ) around the summation fields

If {Command.cost} = 0 then 
    sum({Command.cost}) / sum({@labor gross}) * 100

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when you say subtotals does that mean there are groups?
Are you trying to put them in the group header/footer?
If so change the formula to

If {Command.cost} = 0 then 
    sum({Command.cost}, {YOURGROUPFIELD}) / sum({@labor gross}, {YOURGROUPFIELD}) * 100

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ldhonAuthor Commented:
Thank you again mimcc.  You have really helped me a lot.
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