Advice using aggregate

[gruposenda]

Hi :
I have a list with 3 columns : (1) Kilometers, (2) Liters, (3) calculation=Kilometers/Liters. I need a total for the first and second column, but for the calculation I have doubts, I need the same calculation Kilometers/Liters like a total. How can I use the aggregate to get this result ?
Thanks in advance

 

[blom0344]

total([Kilometers] for report)/total([Liters] for report)

Ties Blom

 

[gruposenda]

Thanks blom0344.
There is additional information : In the first column, I have aggregate function = average and rollup aggregate function=total, for the second aggregate function = total and rollup aggregate function=total, and for the calculation, I have calculated and calculated. My problem is with the calculation at the end of the report. It seems to take the kilometer of the last line before the grand total.
Thanks again.

 

[blom0344]

Hmm, did you try to use my initial suggestion?

Is there any point in rolling up averages as totals?
Averages are by nature non-additive facts (i.e. they cannot be totalled as such , at least not with making any sense)

Ties Blom