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Find price elasticity of demand for double steel sales

Suppose yearly steel sales double to 80 million tons while the price falls $40 per ton, to $180 per ton. Therefore price elasticity of demand for steel is approximately: (w) 3.333. (x) 10.000. (y) 2.500. (z) 6.667.

Can anybody suggest me the proper explanation for given problem regarding Economics generally?

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