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Let in 2008
Sp=x
So down the sale=x*80/100
Sale in 2009
X-x*80/100=20x/100
Now in 2010
Sale=x
Increased value =x-20x/100=80x/100
Now increased value from 2009 to 2010
20x/100 to 80x/100
Or (80/20)*100=400%
I think it is helpful for you lf you like
Mark as brainliest
Sp=x
So down the sale=x*80/100
Sale in 2009
X-x*80/100=20x/100
Now in 2010
Sale=x
Increased value =x-20x/100=80x/100
Now increased value from 2009 to 2010
20x/100 to 80x/100
Or (80/20)*100=400%
I think it is helpful for you lf you like
Mark as brainliest
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