Question: Analysis of return on invested assets, comparison of two divisions, DuPont method. Performance Aid, Inc. has two divisions: Test Preparation and Language Arts. Results (in millions) for the past three years are partially displayed here:
![461_5.png](https://secure.tutorsglobe.com/CMSImages/461_5.png)
1. Complete the table by filling in the blanks.
2. Use the DuPont method of profitability analysis to explain changes in the operating-income-to-total assets ratios over the 2015-2017 period for each division and for Performance Aid as a whole. Comment on the results.