George and Cindy are married taxpayers filing a joint tax return. In 2018, their AGI is $400,000, and their long-term capital gain income (included in the AGI) is $100,000. They have investment interest expense of $3,000 and state and local income taxes attributable to the investment income of $10,000. The AGI threshold amount for the Medicare contribution tax is $250,000 for a married couple filing jointly. What is the amount of Medicare contribution tax that they must pay?

$3,306

$3,686

$3,800

$5,700