For a Hypothetical Economy in 2010, the Deficit Was $300

For a hypothetical economy in 2010, the deficit was $300 billion, the national debt was $3,800 billion, and the average interest rate on the federal debt was 6.0 percent. The amount of interest payments made that year was

A) $246 billion.
B) $270 billion.
C) $228 billion.
D) $18 billion.
E) $225 billion.