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?

• 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%
• 11 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
  
  
• 11 years agoHelpfull: Yes(1) No(1)
• 81% increase
  
• 11 years agoHelpfull: Yes(0) No(1)