A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury ?

A. metal piece will sink to the bottom

B. whole of the metal piece will be immersed with its top surface just at mercury level

C. the metal piece will simply float over the mercury

D. none of the above

E. the metal piece will be immersed in mercury by half

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