Averaging Data By Week - Automatic Calculation?

Jun 18, 2013

I need to average data following the format below by average per week by week/store combination e.g. wk 1/store A average is 6.

Week
Store
Sales

1
A
7

[Code] ..

I can easily use SUMIFS to achieve this, but I have a large amount of data between the weeks of 1-52, a dozen different stores and I will be adding to this. I don't want to have to enter new SUMIFS every time I enter a new wk/store combination. How do I get this info to automatically calculate?

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