Last year Department Store X had a sales total for December that was 4 times the average (arithmetic mean) of the monthly sales totals for January through November. The sales total for December was what fraction of the sales total for the year?


~$1 \over 4$~

~$4 \over 15$~

~$1 \over 3$~

~$4 \over 11$~

~$4 \over 5$~

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