Power BI, issue to sum last working day and last two working day

I have a question on how to calculate the sum of the last previous working day.

Here is my data set:

Date      Name  Amount
16/09/20  A     10
17/09/20  A     10
17/09/20  B     30
18/09/20  A     50
21/09/20  A     20
21/09/20  B     60
22/09/20  B     50

In my dashboard, I have a filter to choose a date of display and I see the sum of today; last previous working day and second last previous working day.
So when I put myself at the date 17/09/2020, I should see this:

Sum for D (17/09/2020) -> 40
Sum for D-1 (16/09/2020) -> 10
Sum for D-2 (15/09/2020) -> blank

When I put myself at the date 18/09/2020, I should see this:

Sum for D (18/09/2020) -> 50
Sum for D-1 (17/09/2020) -> 40
Sum for D-2 (16/09/2020) -> 10

When I put myself at the date 21/09/2020, I should see this:

Sum for D (21/09/2020) -> 80
Sum for D-1 (18/09/2020) -> 50
Sum for D-2 (17/09/2020) -> 40

I don't find a way to sum for a previous day using calculate or sum and previousday is not helpful in my case.

Thanks in advance for the help,

Solution

I just found a solution, here I post it:

For D:

wd = SUM(data[Amount])

For D-1:

lwd = 
    var ad = DATEADD(data[Date];0;DAY)
    var lwd = IF( 
        WEEKDAY(ad) = 1; //sunday
        ad - 2;
        IF(
            WEEKDAY(ad) = 2; //monday
            ad - 3;
            ad - 1 //others
        )
    )
    var sumLWD = CALCULATE(SUM(data[Amount]);data[Date]=lwd)
    return sumLWD

For D-2:

l2wd = 
    var ad = DATEADD(data[Date];0;DAY)
    var lwd2 = IF( 
        WEEKDAY(ad) = 2; //monday
        ad - 4;
        IF(
            WEEKDAY(ad) = 3; //tuesday
            ad - 4;
            ad - 2 //others
        )
    )
    var sumLWD2 = CALCULATE(SUM(data[Amount]);data[Date]=lwd2)
    return sumLWD2

Thanks all for your help and time. Regards,