The price of apple in the year 2010 has increased by 15% from that of the previous year.In 2011 the price has previous year. In 2011 the price has decreased by 10% .In 2011, what was the increase in price respect to that of 2009?

The price of apple in the year 2010 has increased by 15% from that of the previous year.In 2011 the price has previous year. In 2011 the price has decreased by 10% .In 2011, what was the increase in price respect to that of 2009? Correct Answer 3.5%

Here ,Increase x =15% (+)Decrease y = 10% (-)We know = x±y± xy/100= 15-10- (15x10)/100= 5-1.5= 3.5%  
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