Total Calculation based on Total/Day for given Month

troyhimes 
I Plead guilty 🙂
You are absolutely right. I overlooked the data and did not pay enough attention. I did not notice that the Tons/Day values are only in the first day while in other days are blank which is actually your original problem. 
Please refer to updated file with the solution https://www.dropbox.com/t/RYcaBXfL2RcdQd5S
The code is little long. I know it can be shorter and more simple by using GENERATE function but I personally still did not learn how to use it properly. Also can be solved by adding a new calculated column. Pretty sure other methods are available out there. However this one seems to work

MMP_Tons = 
VAR Table1 = 
    SUMMARIZE (
        Actuals_and_MonthlyPlans,
        Actuals_and_MonthlyPlans[Area],
        'Calendar'[YYMM],
        "@Tons", SUM ( Actuals_and_MonthlyPlans[MMP_Tons/Day])
    )
VAR Table2 =
    SELECTCOLUMNS ( 
        Table1,
        "@YYMM", 'Calendar'[YYMM],
        "@@Tons", [@Tons]
    )
VAR Table3 =
    CROSSJOIN ( 'Calendar', Table2 )
VAR Table4 =
    FILTER ( Table3, [YYMM] = [@YYMM] )
VAR Result =
    SUMX ( Table4, [@@Tons] ) 
RETURN
    Result

Please let me know if this solves your problem. Have a nice day!