Problem 21 (2006 AMC 8)

An aquarium has a rectangular base that measures $100\text{ cm}$ by $40\text{ cm}$ and has a height of $50\text{ cm}$. The aquarium is filled with water to a depth of $37\text{ cm}$. A rock with volume $1000\text{ cm}^3$ is then placed in the aquarium and completely submerged. By how many centimeters does the water level rise?