Doubt in data Dedicated session 7

hey,
i have attached a screenshot below of question 24, from data dedicated session 7. In that you have taken 10% for $50,000 and more , could you please explain why is it 10%, as for the first part of the question you have written 22% which i understood as i can map it on the graph.
Please help me out and if you didn’t understand my query then please let me know
Thank you