Dax to join a table to a grouped table to do math

[martingaleh]

I could never get pictures to save. Anyway,

I have a table (Table A):

https://pasteboard.co/HpTLfSL.png

and another table (Table B)
https://pasteboard.co/HpTLsxl.png

and I want to aggregate (Table B agg):
https://pasteboard.co/HpTLGFn.png

I can do this in power pivot. But then I want to join that back to the inital table and do math (resulting table)
https://pasteboard.co/HpTLR0x.png

Note here, this resulting table is joined by d2 and d3, which I don't show.

How do I make this. I image its' going to be an enormous nesting of calculates and sumx's.

 

[martingaleh]

Sorry, Table B was wrong. This is it:
https://pasteboard.co/HpTTywk.png