Given that,

Weight of copper is 42.3 kg and tin weight 2.7 kg​.

To find,

The percentage of copper.

Solution,

Weight of copper is 42.3 kg

Weight of tin is 2.7 kg​

It means that the net weight of two metals is 42.3 kg + 2.7 kg​ = 45 kg

The percentage of copper is given by :

So, the percentage of copper is 94%.

what is the percentage of copper if the casting weight of copper 42.3kg and tin weight 2.7kg