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?
A
¼
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B
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C
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D
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Solution
The correct option is B Let, average sales from January through November = a; December Sales = 4a; Total Sales = 11a + 4a = 15a; Fraction = 415