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Bunuel
An electrical appliances store sold this month 400% more than the average of all the other months in the year. The sales total for this month was approximately what percent of total sales for this year?

A. 14%.
B. 21%.
C. 31%.
D. 37%.
E. 43%.

Say, the average sales for all the other months (11 months) of the year is x.
So, the total sales of those 11 months will be= 11x

Now, this month's sales, which is 400% more than the average of other months' sales, is 5x, (x+400% of x).

Thus, this months' sales are (5x/16x)*100=31.25% of the total yearly sales. [Total sales=11x+5x=16x]

Answer is B
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