If you are paid $90k per year, your cost to the company is at least $110K a year, if not more. Company's share of payroll tax on $90k in the US is nearly $7,000, office space at $30-$40/square foot can be $2,000 a year, ten paid days off a year cost nearly $4,000, hundreds of dollars a year more for desks/computer systems.

Then you add medical/dental/401k matching, etc, etc.

If they offer stock options that can be easily tens of thousands more in imputed costs.