The table below displays the results of a survey of 150 employees regarding their primary method of commuting to work. Of the employees who do NOT walk to work, what fraction commute by bus?
| Commute Method | Number of Employees |
|---|---|
| Car | 60 |
| Bus | 35 |
| Train | 25 |
| Walk | 10 |
| Bike | 20 |
| Total | 150 |
