Jonathon, age $50$ and in good health, withdrew $$6,000$ from his pension plan during the current year. The withdrawal was not eligible for any exception to the $10\%$ penalty. Jonathon had made $$40,000$ of after$-$tax contributions to the plan while his employer had contributed $$80,000.$ In addition to relevant income taxes, how much penalty must Jonathon pay?

$$0$

$$200$

$$400$

$$600$