custom expression average sales per customer per period in graphical table

Hi, 

I need to calculated the average sales per customer per specific product per week/month in graphical table. in the graphical table i have column with customer name, sales in 2017 total, and average sales per customer (this one i am trying to created now). Any ideas which custom expression should i use to created this new average sale per customer column? 

Thank you in advance!

KR Alex 

(1) Answer

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