No CALCULATE Challenge -- Round #2

AlexisOlson and All,

I was completely convinced that No CALCULATE solution wasn't possible for such kind of problems. My belief is that filter context manipulation is exclusively CALCULATE branded. Yesterday while handling a DAX issue, AlexisOlson No CALCULATE challenge popped up in my mind. With a probable solution, I decided to try the first thing in the morning and seems it covers all the requirements.

Sales Benchmark Ratio 2 = 
VAR _BenchmarkSales =
    SUMX (
        ALLSELECTED ( Geography[RegionCountryName] ),
        SUMX ( 
            CROSSJOIN (
                TREATAS ( { "North America" }, Geography[ContinentName] ),
                TREATAS ( { "Store" }, Channel[ChannelName] )
            ),
        [Sales Amount]
        )
    )
VAR _Ratio =
    DIVIDE ( [Sales Amount], _BenchmarkSales )
RETURN
    _Ratio