from 2008 to 2009, the sales of a book decreased by 80%. If the sales in 2010 was the same as in 2008, by what per cent did it increase from 2009 to 2010?

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Accepted Answer

Let sale in 2008 = 100 Sale in 2009 = 20 Sale in 2010 = 100 ∴ Required increases = [(100 - 20)/20] x100 = (80/20) x 100 = 400%

from 2008 to 2009, the sales of a book decreased by 80%. If the sales in 2010 was the same as in 2008, by what per cent did it increase from 2009 to 2010?

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