Answer
550,000 gal
Work Step by Step
To find the increase in supreme unleaded gasoline sales from 2009 to 2013
We need to first find the amount of gasoline in each year from 2009 to 2013.
In 2009 the supreme unleaded gasoline sale was 150,000 gal
In 2010 it increase to 300,000 gal
So difference between 2009 and 2010 = 300,000 gal - 150,000 gal = 150,000 gal
now in 2011 it increases to 400,000 gal
So difference between 2011 - 2010 = 400,000 - 300,000 = 100,000 gal
Again in 2012 it increases to 650,000 gal
Difference between 2012 and 2011 = 650,000 gal - 400,000 gal = 250,000 gal
in 2013 it increases to 700,00 gal
So difference = 700,000 gal - 650,000 gal = 50,000 gal
Now the total increase = 150,000 + 100,000 + 250,000 + 50,000 = 550,000 gal
Therefore the increase in supreme unleaded gasoline sales from 2009 to 2013 is 550,000 gal
