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Why recycling of metal is more cost effective?

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Why recycling of metal is more cost effective?

(a) Extraction of metal increases

(b) Increases operating cost

(c) Reduces operating cost

(d) Reduces odor

I had been asked this question by my college professor while I was bunking the class.

This interesting question is from Basic Aspects of Solid Waste Management in division Biotechnology for Solid Waste Management of Environmental Biotechnology

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The correct choice is (c) Reduces operating cost

To explain: Recycling of metal highly reduces the operating cost and the industrial cost as extraction cost is reduced and energy consumption is also reduced, extraction of metal decreases and odor is not relative.

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