Percentage with COUNT measure excluding page filtering

[splambo2]

My table shows each file's name and type like so, and there are no duplicates:
_____________________________
FileName          |    FileType
------------------------------
cloudimage            jpg
annualreport          pdf

monthlyreport       pdf
catvideo                 mp4

geodata                 json

My report has two visuals:
1) Horizontal bar chart showing how many files of each type are in the table.
2) Card showing a percentage.

EXPECTED RESULTS
When all the bars are selected, the card should show 100%
When I select the bar for PDF, the card should show 40%
When I select all bars except jpg, the card should show 80%

I successfully created this measure to count the occurence of each filetype (which are text data)

MeasureA = (COUNT('Table'[FileType]))

I have unsuccessfully tried creating a second measure to use for the card visual, such as:

percentageMeasure = [MeasureA]/COUNTROWS('Table')

I tried everything I could think of: DIVIDE, CALCULATE, ALL, REMOVEFILTERS, EXCEPTALL, COUNTROWS but I can't find how to ignore the page filtering and display the correct percentage in the card. I only get:
1) 100% all the time - because 2 pdf files / 2 pdf files = 1
2) Error message about 'paramater is not the correct type', expecting a number, expecting a string, or 'cannot be found or may not be used.'

How can I get this card to show the correct percentage?

[splambo2]

@gmsamborn You beat me to the answer by a minute 🙂 Thank you!
It also works with REMOVEFILTERS instead of ALL.

[gmsamborn · Accepted solution]

Hi @splambo2 

Would a measure like this help?

Pct = 
    DIVIDE(
        COUNT( 'Table'[FileName] ),
        CALCULATE(
            COUNT( 'Table'[FileName] ),
            ALL( 'Table' )
        )
    )

Let me know if you have any questions.

splambo2.pbix