It is simply following the instructions given in the question.
2% of salary = 2% x 120,000 = $2,400.
So if the ROI is 11% (1% above 10%) then they get $2,400. If it is 12% (2% above 10%) then they get 2 x $2,400 and so on. Subject to a maximum bonus of 30% x $120,000 = $36,000
Obviously, even if you got the ROI’s wrong in Section A, you still get full marks for Section B is you calculated the bonus’s correctly on your ROI’s.