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Maths Puzzle
Q: From 2008 to 2009, book sales decreased by 80%. If sales in 2010 were the same as they were in 2008, by what percent did they increase from 2009 to 2010?
Read Solution (Total 3)
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- suppose in 2008 price z 100.
then in 2009 it wil b 20.
& in 2010 it is again 100.
so increased price from 2009 to 2010 z 80.
so % increased price from 2009 to 2010=(80*100)/20=400% - 12 years agoHelpfull: Yes(7) No(0)
- ans shuld be 400%
let sales in 2008 be x
then in 2009 it becomes 0.2x
in 2010 it again become 0.2x*400%=0.8x
- 12 years agoHelpfull: Yes(1) No(1)
- 81% increase
- 12 years agoHelpfull: Yes(0) No(1)
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