Answer:
A. $450
Step-by-step explanation:
In 2014, the Medicare surtax for high-income taxpayers started when married couples filing jointly earned over $250,000. in this case, Christine and Doug made $300,000, so the surtax = ($300,000 - $250,000) x 0.9% = $450
The Medicare surtax income threshold has not been adjusted to inflation and remains at the same level for 2020.
Total medicare contributions for high income taxpayers = 1.45% + 0.9% = 2.35%