A solid rectangular block has the a length of 64.5 cm and a width of 32.0 cm. The thickness of the block is not known accurately, but it is less than 10 cm. The density of the block's material is 350kg / (m ^ 3) If the block is placed in a large bucket of water of density 1000kg / (m ^ 3) what fraction of its volume will be above the surface of the water?

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