The school bus in the fourth district of Dalian is charged by the kilometer. According to public information, the school bus charges in four districts of Dalian are as follows.

1. All-round students within 4 kilometers (including 4 kilometers) from the school will receive 350 yuan every semester.

2, 4 km to 6 km away from the school (including 6 km) all-round students each charge 450 yuan.

3. Students who are 6 km away from the school to 15 km will receive 600 yuan every semester.

4. Students who are more than 0/5km away from the school/kloc-will receive 800 yuan every semester.