Final answer:
The interest payments on the federal debt in 2018 were 1.8% of GDP.
Step-by-step explanation:
In 2018, the interest payments on the federal debt were 1.8% of GDP. This means that the government spent 1.8% of the total value of goods and services produced in the country on paying the interest on its debt. It is important for the government to manage its debt and interest payments to ensure fiscal stability.