Pay $19.85 (69.7%)
Benefits $8.64 (30.3%)
The cost of benefits break down as:
Health, disability and life insurance $2.39
Social security, medicare, unemployment insurance and workers comp $2.25
Vacation, holiday, sick leave and personal leave $1.99
Retirement and savings $1.25
Supplemental pay $0.76
Here is how the separate benefits and the base pay look as %'s of the whole:

Keep in mind these are average numbers. So they may be skewed up or down. The median numbers would give a better representation of the 'typical' worker.