Use report variables to sum weight and value, which can then be used in your footer to do the calculation.

Bob

>I have this problem with totals
>
>In a report with a kind of structure like this :
>
>group 1
>group 2
> month1 month2 month3 month4 . . . . . month12
>
>weight
>Value
>----------------
>group2 footer
>
>tot weight
>tot value
>-------------
>group 1 footer
>
>well, i can have the totals weight and value using the "calculate" function of reports, but i dont' know how to get the middle price sum(weight) / sum(value)
>
>How can i do ?