Discovere Calculated Totals

Hello all:
I need to build a cross tab report with totals to the right of the report for the data points, the problem is that these total needs to be averages and weighted averages, so if you have 100 bottles done out of 200 for some month this will be 50% for that month and if you have 500 out of 2000 done for another month then this is 25% for the this month but the average that will show against the percentage completed will be 50+20/2 = 35% but what I want is 100+500/(200+2000) = 27.27% can this be done for the totals some how or if there is any other way of doing it to be displayed as a total ( the report has to be cross tab).
Thanks a lot
Khaled Jamoos

Thank you for your answer but I wouldn't have posted here if I didn't try all of this, the problem is that I have to display the average in the same column of the sum so it can't be a seperate column as the the columns (the top axis) in this cross tab report is the Month so I have to have a last column in the end that will display sum against the BOTTLES_REQUIRED and a sum against BOTTLES_DONE and in the same column I will be displaying the average against the PERCENTAGE_COMPLETED so for each month you will have an entry against the PERCENTAGE_COMPLETED and in the last column instead of sum it will have an average for the totals not an average of the entries against the PERCENTAGE_COMPLETED, this is how it appears:
JOB_TYPE-------------------------------------JAN 2008----------------------------FEB 2008-------------------------------Year To Date(SUM or average)
---BOTTLING-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
------- BOTTLES_REQUIRED----------------1000---------------------------------1500--------------------------------------SUM(BOTTLES_REQUIRED) = 2500
--------BOTTLES_DONE-----------------------950----------------------------------1400--------------------------------------SUM(BOTTLES_DONE) = 2350
--------PERCENTAGE_COMPLETED--------(950/1000) = 95.00------------(1400/1500) = 93.33%-----------((1400+950)/(1000+1500)) = 94.00%
The last part if I would use a normal average it would be (95+93.33)/2 = 94.165%. I tried to change it to a tabular report but the problem is that i need to display the months on the top axis according to the date, job type and other parameters applied.
Thanks so much in advance
Khaled jamoos

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