2. A mathematics department uses 20 teaching assistants to aid in its four-semester calculus course. The number of teaching assistants assigned to each level of the course depends on enrollment. Here are the fall enrollments:
| Calculus I | 500 |
| Calculus II | 100 |
| Calculus III | 350 |
| Calculus IV | 175 |
| Total | 1125 |
How many teaching assistants should be assigned to each level of the course?