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Ratio to determine income elasticity of demand

The income elasticity of demand [at a specified price] is computed by the ratio of the relative: (a) change in quantity demanded over a given proportional change in income. (b) reciprocal of the price elasticity of supply. (c) slope of the demand curve. (d) angles at which demand intersects supply.

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

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