Filtering pareto

Hello,

I've a list of sales with a line each time an article is sold, the date and the sell amount. I've created a measure in order to do a Pareto analysis:

Pareto = 
VAR CostVar = [Total_Cost]
VAR All_CA = CALCULATE([Total_Cost],ALLSELECTED(Sales))

RETURN
DIVIDE(
SUMX(
    FILTER(
            SUMMARIZE(ALLSELECTED(Sales),Sales[Article],
                "CA", [Total_Cost]),
                    [CA] >= CostVar),
                        [CA]),
    Total_CA,0)

The result I obtain at the end is something like this:

The only problem I have now it's that I cannot apply a filter on the CA[%].

Is there any way to apply a filter on this column up  to a certain value ?