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Price elasticity of demand on mid point

When 900 tons of gourmet coffee beans are sold per month at $5.40 per pound but sales drop to 500 tons while its price rises to $7.20 per pound, the price elasticity of demand for that coffee based upon the mid-point or say arc formula is: (i) 2.0. (ii) 0.57. (iii) 6.125. (iv) 0.5. (v) 0.33.

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