We have a table student_results with students' points for entry exams and the maximum possible amount of points.
| student name | points | maximum points possible |
| John B. | 376 | 400 |
| Kate O. | 350 | 400 |
| Mary P. | 388 | 400 |
| Michael M. | 320 | 400 |
| Sam W. | 390 | 400 |
Choose a correct code with a CTE expression that returns a column with the percentage of students' points.