Let x be the average sales per month for the first 11 months, then the total sales for the whole year would be (11 months) + (December) = 11x + 4x = 15x.
(December)/(Whole year) = 4x/(15x) = 4/15.
Answer: B.
(December)/(Whole year) = 4x/(15x) = 4/15.
Answer: B.
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