To determine how much money Mini Motorbikes & More will make from selling nine tickets, we can refer to the step function you described.
From the information provided:
- The first pair is \( (0, 50) \) open circle and connects with a solid line to \( (3, 50) \) closed circle. This indicates that for 0-3 tickets sold, they make $50.
- The second pair is \( (3, 100) \) open circle, connected with a dashed line to \( (6, 100) \) closed circle. This means that for 3-6 tickets sold, they make $100.
- The third pair is \( (6, 150) \) open circle, connected with a dashed line to \( (9, 150) \) closed circle. Hence, for 6-9 tickets sold, they make $150.
Since 9 tickets fall within the range of 6-9, we can conclude that they will earn $150 if they sell nine tickets.
Therefore, the answer is C. $150.