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avg

by baller12q » Thu Apr 02, 2009 7:40 am
A certain store found that last year the avg. monthly sales from January through Oct. was 12,000. In Nov-Dec the monthly sales were 3 & 5 times respectivly the avg for the other 10 months. What was the store's avg monthly sales last year.

a. 180,000
b. 216,000
c. 252,000
d. 318,000
e. 360,000




OA A
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by shidoshide » Thu Apr 02, 2009 10:43 am
avg of Jan - Oct : 12000 (for each month)
so, avg of Nov : 12000 x 3
avg of Dec : 12000 x 5

That means, the average monthly sales is [(12000 x 10) + (12000 x 3) + (12000 x 5)] /12 = (12000 x 18) / 12 = 18000.
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by lilu » Thu Apr 02, 2009 10:45 am
shidoshide wrote:avg of Jan - Oct : 12000 (for each month)
so, avg of Nov : 12000 x 3
avg of Dec : 12000 x 5

That means, the average monthly sales is [(12000 x 10) + (12000 x 3) + (12000 x 5)] /12 = (12000 x 18) / 12 = 18000.
This is what I got as well.
I guess all the answer choices have extra zeroes.
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