The correct number to use is called "total employee compensation". This includes:

1. salary

2. paid days off

3. health care benefits

4. retirement benefits

5. employer 401k contributions

6. incentive stock plans

7. taxes paid on behalf of the employee (such as the so-called employer's contribution to social security)

8. free food in the company cafeteria

9. any other benefits that cost money

The cost to employers for these benefits adds about 30% to total employee compensation.