A solid piece of plastic, with a density of 890 kg/m³, is placed in oil with a density of 830 kg/m³ and the plastic sinks (1). Then the plastic is placed in water and it floats (2). 

(a) What percentage of the plastic is submerged in the water? 

(b) Finally, the same oil in which the plastic sinks is poured over the plastic and the water. Will less (3) or more (4) of the plastic be submerged in the water compared to 2? Explain. 

(c) Calculate the percentage of the plastic submerged in the water.

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