Fully loaded costs (health benefits, 401k matching, cost of computer, HR business partners, etc.) for an employee are roughly 2x what their salary is. So yeah, 200k is a good estimate.
That's still very high. Average salary is much lower than $100k in the US. Even among college grads with 10+ years of experience, $100k is still a high-end job paying a high-end salary. It's nowhere near the average.