While cooling, a cubical casting of side 40 mm undergoes

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While cooling, a cubical casting of side 40 mm undergoes 3%, 4% and 5% volume shrinkage during the liquid state, phase transition and solid state, respectively. The volume of metal compensated from the riser is

1. 2%
2. 7%
3. 8%
4. 9%

Correct Option: B

The riser can compensate for volume shrinkage only in the liquid stage and transition stage and not in the solid state.
Hence volume of metal that needs t o be compensated from the riser = 3 + 4 = 7%