Countrows with filters from current table applied only

Update: I've found a different way to organize my data, so I don't need this anymore

Hi,

Here's my PBI report with sample data: https://www.dropbox.com/s/9k0fth7qed7t33n/sample%20data.pbix?dl=0

So, here's the full set of data:

'Country of origin' comes from the 'Master Data' table (attribute table), while the other values come from the '2 Snacking Occasion' table. 

This is the model view:

My entries measure is simply a countrows of the 'master data' table.

What I'm trying to get is if I have a slicer (field will be from master data table) applied, say for example, 'Europe & Americas' chosen for 'country of origin', the % by value should display as 80% (4 divided by 5) for the afternoon snacking category.

Basically the denominator portion of the divide function should count rows for all entries in the master data table without the filters from the '2 Snacking Occasion' table being applied.

This should work for all attributes chosen, e.g. gender, age, city, etc.

Thank you!