How to create formula based on Sales for each week

Question

Hi,
I have a requirement to show Variance in Sales in a separate column. My data in the cube is like this.
Week         $Sales
1                  80
2                 100
3                 120
Now I want the report output like this.
Week      $Sales          Variance
1              80          
2             100           1.25 (100 / 80)
3             120           1.2 (120/100)
Formula for Variance column for row 2 (Week 2) will be week 2/week1 sales.
I do not want to use cell editor because this will give fixed rows/columns and also I want to display week in the rows.
Any help will be greatly appreciated
Thanks,
Laxma

Answer 1

Hi,
Thank you for your time but probably I misguide you with less data in my example..
Here is my scenario.
Data in the cube is stored by week as shown below
Week         Sales         
01/2007      45           
02/2007      65             
03/2007      55              
04/2007      80             
05/2007      95           
Required output   
Week        Sales         Build %
01/2007      45             0
02/2007      65             1.44
03/2007      55              0.85
04/2007      80             1.45
05/2007      95             1.19
Formula for Build % = Current Week Sales / Previous Week Sales.
Example for week 03/2007 (i.e Row 3) build % = 55 / 65 that will give 0.85.
Any help will be greatly appreciated
Thanks