Answer
a. 139.2 million; Between the end of 2008 and the end of 2009, Air Tran's profit increased by $139.2 million.
b. Not applicable- interval includes zero.
c. 139.2 million per year; between the end of 2008 and the end of 2009, AirTran's profit increased by 139.2 million per year.
Work Step by Step
a. change = a - b. So 17.6 - (-121.6) million = 139.2 million dollars
b. This is not applicable because the numbers span across 0 and we cannot divide by 0.
c. This is change over time. in the question we see time is year. So we put 139.2 which is change and time which is year. So 139.2 million dollars per year.
