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Which one of the following formulae based on the given diagram would be appropriate for measuring the elasticity of demand at point R?
Economics mcq question image

Which one of the following formulae based on the given diagram would be appropriate for measuring the elasticity of demand at point R?
Economics mcq question image Correct Answer $$\frac{{RB}}{{RA}} = \frac{{QB}}{{OQ}} = \frac{{OP}}{{PA}}$$

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