As, mentioned in the 'sale of products' graph, there percentage decrease in the sales of products in 2010 and 2012. So check the percentage increament in 2008,2009 and 2011 only as compared to the previous year. ∴ Percentage increase in 2008 =
(600−400)
400
×100=50% Percentage increase in 2009 =
(1000−600)
600
×100=66.66% and percentage increase in 2011 =
(1200−800)
800
×100=50% ∴ Percentage increase is maximum in 2009 as compared to 2008 .