Martha and Marty Mertens are married and file a joint return. Marty started his own business at the beginning of the current tax year and reported net income of \(\$ 14,000\) for the year. Martha worked full time as a waitress earning \(\$ 8,000\), excluding tips of \(\$ 3,000\). Marty and Martha maintained a home for their 11 -year-old son. What is their earned income credit for 2018 ?