In 2003, the average monthly rainfall in Mathborough was $41.5 \mathrm{~mm}$. In 2004, the average monthly rainfall in Mathborough was $2 \mathrm{~mm}$ more than in 2003. The total amount of rain that fell in Mathborough in 2004 was
(A) $500 \mathrm{~mm}$
(B) $522 \mathrm{~mm}$
(C) $496 \mathrm{~mm}$
(D) $498 \mathrm{~mm}$
(E) $1700 \mathrm{~mm}$
Since the average monthly rainfall was $41.5 \mathrm{~mm}$ in 2003 , then the average monthly rainfall in 2004 was $41+2=43.5 \mathrm{~mm}$.

Therefore, the total rainfall in 2004 was $12 \times 43.5=522 \mathrm{~mm}$.

ANSWER: (B)