Assume the following sales data for a company:

2014	$1,091,400
2013	861,100
2012	659,600
2011	515,500

If 2011 is the base year, what is the percentage increase in sales from 2011 to 2013?

Select one:

a. 67.0%

b. 100.0%

c. 28.0%

d. 59.9%