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A rectangular sheet measuring 80 cm by 50 cm is 2 mm thick and is made of metal whose density is 2.5g/cm^3. A square of side 5 cm is removed from each corner of the rectangle and the remaining part folded to form an open cuboid.
b) The cuboid is filled with water whose density is 1 g/cm^3. Calculate the mass of the cuboid when full of water.