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Ratio of percentage changes in quantity of good

The ratio of the percentage change within the quantity of beef sold over the percentage change within the price of pork is: (1) price elasticity of demand for beef. (2) price elasticity of demand for pork. (3) income elasticity of demand. (4) cross elasticity of demand. (5) cross elasticity of supply.

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

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