Sawyer Corporation's 2015 sales were $5 million. Its 2010 sales were $2.5 million.
a. At what rate have sales been growing?
b. Suppose someone made this statement, "Sales doubled in 5 years. This represents a growth of 100% in 5 years; so dividing 100% by 5, we find the growth rate to be 20% per year." Is the statement correct?