DIVIDE DISTINCT COUNT WITH FILTER

[Sachet_716]

I need help please...

I have this measure:

     Measure % = DISTINCTCOUNT (Sales [CustomerCode]) / DISTINCTCOUNT (CustomerList[CustomerCode])  

In my Sales table, I have different brands and I want to measure the precentage of cutsomers who purchased Brand 1 to overall customers from the Customer list Table. My problem is, whenever i filter Brand (which I need for this DISTINCTCOUNT (Sales [CustomerCode]), my CustomerList is also filtered here DISTINCTCOUNT (CustomerList[CustomerCode]) .

My objective is to divide distinct no.of cutsomers from Sales Table to the OVERALL number of customers in CustomerList. 

Example: No. of Customers in Sales Table (250) / No. of Customers in my CutsomerList Table (300)   - I am getting this already

               No. of Customers for Brand 1 (97) / No. of Customers in my CutsomerList Table (300)     - This is where my issue is  😞

Thank you guys in advance! 

Rgds, Sachet