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In a small snack shop.....

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In a small snack shop..... [#permalink] New post 08 Oct 2010, 04:38
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In a small snack shop, the average (arithmetic mean) revenue was $400 per day over a 10-day period. During this period, if the average daily revenue was $360 for the first 6 days,what was the average daily revenue for the last 4 days?

A. $420
B. $440
C. $450
D. $460
E. $480
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Re: In a small snack shop..... [#permalink] New post 08 Oct 2010, 04:45
Ans. 460
400 x 10= 4000
360 x 6 = 2160
4000-2160 = 1840/4=460

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Re: In a small snack shop..... [#permalink] New post 08 Oct 2010, 15:09
pzazz12 wrote:
In a small snack shop, the average (arithmetic mean) revenue was $400 per day over a 10-day period. During this period, if the average daily revenue was $360 for the first 6 days,what was the average daily revenue for the last 4 days?

A. $420
B. $440
C. $450
D. $460
E. $480


Avg(10 days) = (Avg(6 days)*6 + Avg(4 days)*4)/10
10*$400 = 6*$360 + 4*x
x+6*90=1000
x=460

Answer is (D)

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Re: In a small snack shop.....   [#permalink] 08 Oct 2010, 15:09
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