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kevincan
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A. That's an old post! Is there an OA?

let n be the sales

n2005=j+f+m+a+...+n + Dec2005
n2006=1,1(j+f+m+a+....+n) +Dec2006

n6 =1,1(n5-D5) +D6

n6-n5=1,1n5-1,1D5 +D6 -n5
=0,1n5 + D6 - 1,1D5

We know that december 2005 lowest sale, so D5<n5/12. The difference still positive. SUFF

2.

Don't know if i understand:

0,25.n6>0,97.0,25n5
n6>0,97n5

INSUFF
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Going for A too


total sales of first 11 months in 2005 is X
So the sales of first 11 months in 2006 is > 11X / 10 (considering 10% increase)

From 1) Sales for 2005 Dec was lowest
So it has to be lesser than the average of sales of first 11 months
Dec 2005 Sales 12X /11
2006 SAles > 2005 Sales



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