I thought about that but i don't know how many groups1 i will have and i wanted to let the report to do the "dirty work" :)
>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 ?