Solve the Problem

Multiple Choice

Solve the problem. Round dollar amounts to the nearest cent. Use ordinary interest unless otherwise indicated.
-On October 12, Marge Smith paid a state income tax payment, which was due on June 30. The penalty was 10% simple interest on her unpaid tax of $641. Find the penalty using exact interest.

A) $18.44
B) $18.52
C) $18.26
D) $17.91