AMC 10A 2007 Problem 3

An aquarium has a rectangular base that measures 100 \mathrm{~cm} by 40 \mathrm{~cm} and has a height of 50 \mathrm{~cm}. It is filled with water to a height of 40 \mathrm{~cm}. A brick with a rectangular base that measures 40 \mathrm{~cm} by 20 \mathrm{~cm} and a height of 10 \mathrm{~cm} is placed in the aquarium. By how many centimeters does the water rise?

Answer Choices
A. 0.5
B. 1
C. 1.5
D. 2
E. 2.5