Divide all Returned sales values on only sales values in January from the same year

[Hadi2021]

Hi all 

I asked this question ywo days ago , but seems I missinterpert my problem ,

https://community.powerbi.com/t5/Desktop/Divide-all-dates-values-on-a-a-specific-date-value-from-a/m...

I will try to give more details her 

I have the the following table: 

And I would like to great new measure (column) that can fill all months sales with the value of January and then divide this is the returned column , meaning that I ma interesting in knowing the return ratio for each month comparing with only September . 

The resulted table should be like this : 

Where E2 = D2/C2 

Thanks in advance 

Regards 

[V-lianl-msft]

I see that the thread you released before has been resolved, this solution meets your needs. If there are any problems, please let me know.

[amitchandak]

@Hadi2021 , Join you table with date table having year and month column and try measure like

% = divide(sum(Table[return]) , sumx(filter(allselected(Date), Date[Year] = max(Date[Year]) && Date[Month] =1), Table[sales]) )