DISTINCOUNT IF certain condition met

Hello, ckhoo2007 

I create two measures to sum total in pie chart. I also modified the total to make it display correctly. You can check the below sample file.

Like this:

Measure1 = 
SUMX (
    ADDCOLUMNS (
        ADDCOLUMNS (
            SUMMARIZE (
                ALLSELECTED(  Sales ),
                Sales[Client],
                "t30",
                    CALCULATE (
                        DIVIDE (
                            SUMX ( 'Sales', 'Sales'[Sales] * 'Sales'[Transactions] ),
                            SUM ( 'Sales'[Transactions] )
                        ),
                        DATESINPERIOD ( Sales[Date], MAX ( Sales[Date] ), -30, DAY )
                    ),
                "t60",
                    CALCULATE (
                        DIVIDE (
                            SUMX ( 'Sales', 'Sales'[Sales] * 'Sales'[Transactions] ),
                            SUM ( 'Sales'[Transactions] )
                        ),
                        DATESINPERIOD ( Sales[Date], MAX ( Sales[Date] ) - 30, -30, DAY )
                    )
            ),
            "t30-t60", [t30] - [t60]
        ),
        "bb", IF ( [t30-t60] > 0, 1 )
    ),
    [bb]
)

Did I answer your question ? Please mark my reply as solution. Thank you very much.
If not, please feel free to ask me.

Best Regards,

Community Support Team _ Janey