16.1 The CPI for 1984 is 103.9, and the CPI for 2015 is 238.7. So the 1984 median salary in 2015 dollars is

16.2 The CPI for 1984 is 103.9, and the CPI for 2013 is 233.0. So the 1984 earnings in 2013 dollars are

631

In terms of real earnings, the change between 1984 and 2013 is

That is, the real earnings have decreased by 18.9%.