A fish tank, in the shape of a rectangular prism, has a base measuring 20 cm by 40 cm with a height of 30 cm. The tank sits on a horizontal table and is half full of water. If 4000 cm3 of water is added, what is the new depth of the water?
(A) 5 cm (B) 15 cm (C) 20 cm (D) 25 cm (E) 10 cm
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