Help with DAX

Hi Singh_Yoshi ,

I created a sample pbix file(see the attachment), please check if that is what you want.

1. Add a index column in Power Query Editor

= Table.AddIndexColumn(#"Changed Type", "Index", 1, 1, Int64.Type)

2. Create a measure as below 

Measure = 
VAR _index =
    SELECTEDVALUE ( 'Table'[Index] )
VAR _curmsrp =
    SUM ( 'Table'[MSRP] )
VAR _nextmsrp =
    CALCULATE (
        SUM ( 'Table'[MSRP] ),
        FILTER ( ALLSELECTED ( 'Table' ), 'Table'[Index] = _index + 1 )
    )
RETURN
    DIVIDE(_nextmsrp ,(( _curmsrp+[Contents])*100))

If the above one can't help you figure out, please provide some raw data in your tables (exclude sensitive data) with Text format, the formula of measure [Contents] and your expected result with backend logic and special examples. You can add the required info in my attached pbix file.

Best Regards