DAX calculating percentage

I'm trying to calculate a percentage , I have done this before and can't see why it's not working:
The basic formula I'm using is

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I've attached a workbook , just straight sum up and dvide.

Richard.

Apparently yes,
My thinking was dividing the Sales of each row by All the sales. But I was wrong.
Thanks,
rd

Sorry to bother you , but I've tried using 'remove filter' rather than 'all', I think this was recommended on sqlbi video,
but I've never been able to access this, it just doesn't appear on the intelligence drop down,
Any ideas?

Richard.

Ahh,
I'm usually in power pivot, as I'm more familiar with that environment.
After a gap of over ten years, I started using excel again nearly a year ago so still find bi a bit confusing especially as I'm old enough
to just about remember the 5 1/4 floppy disc.
Problem solved.

Richard.