Answer:
1 is the base index of CPI, so a value of 0.418 means that the prices were 0.418 times the base index and 2.4 means that prices were 2.4 times the index
The 1972 graduate's job paid $7200 in nominal terms and (7200/0.418) in real terms
Real terms 1972= 17224
Real terms 2016= 25000
17224/25000= 68%
The 1972 graduate's job paid 68 percent of the 2016 graduates job in real terms.
Explanation: