A fish tank in the shape of a rectangular prism has a length of 50 cm, a width of 30 cm, and a height of 40 cm. If the tank is filled with water to a height of 35 cm, what is the volume of water in the tank in liters? (Note: 1 cubic centimeter = 0.001 liters) Let's think step by step and output the final answer within \boxed{}.
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