DAX Measure - weighted distinct count

Hi,

I'm struggling to work out how to resolve this query. Hopefully I can explain it well enough!

I have a table that has columns for [Owner], [Placement Id], [Ownership %], [Plc Start] amongst others

I have a measure that counts the number of unique [Placement Id] for a given date range (I'm grouping by week in my date table) which works correctly:

Contract Fills = 
    VAR MinDate = MIN('Calendar'[WeekStartDate])
    VAR MaxDate = MAX('Calendar'[WeekEndDate])
    RETURN
    CALCULATE (
        DISTINCTCOUNT ( FullResults[Placement Id] ),
        FILTER ( FullResults, FullResults[Row Type] = "Realised Contract Temp" ),
        FILTER ( FullResults, FullResults[Plc Start] >= MinDate && FullResults[Plc Start] <= MaxDate )
    ) 

However, I need to extend this by the Ownership %. I can guarantee that Ownership % is unique to Placement Id but I can't figure out how to multiply the count of Placement Id by the Owernship % for that Placement Id.

Assuming this table is within all in my date filter, I should get: