If method A is used, then the cost of producing 100 gram of metal is:
"6.45\/(300\u00d70.8)\u00d7100 = 2.69."
If method B is used, then the cost of producing 100 gram of metal is:
"5.25\/(300\u00d70.8)\u00d7100 = 2.19."
So, the method B is better.
At current price of 3.7 both processes are economical.
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