Susan and Stan Collins live in Iowa, are married and have two children ages 6 and 10. In 2018, Susan’s income is $38,290 and Stan’s is $12,000 and both are self-employed. They also have $500 in interest income from tax-exempt bonds. The Collins enrolled in health insurance for all of 2018 through their state exchange but did not elect to have the credit paid in advance. The 2018 Form 1095-A that the Collins received from the exchange lists the following information: 

Annual premiums..................$9,800 

Annual premium for the designated silver plan in the state..................$10,800

Compute the Collins’ premium tax credit for 2018.