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2% difference when calculating Percentage between 2 columms



I have the following where i have selected a value from a customer dropdown and then when i select this and calculate the percentage using a measure it is out by 2% everytime. How can i resolve this



Count %  = DIVIDE(DISTINCTCOUNTNOBLANK(Table[Column1]), (DISTINCTCOUNT(Table[Column2]))) *100


So there is (11/63)*100 is 17.46% 
but the Measue is giving 19.23% 
Do i need to include an AllSelected or something as i am using the filter? 
Super User
Super User


Not enough details and context. Try using either DISTINCTCOUNTNOBLANK or DISTINCTCOUNT for both columns.

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