Arc elasticity measures the midpoint between two selected points. It is given by the formula: E P P QD QD Q P D ?? D ?? , , 1 2 1 2 2 2 ?? , , , , , p p qd qd q p 1 2 d 1 2 ?? , Using the values given in the question, we have P1 = Rs. 960; P2 = Rs. 1000; Q1 = 4600 units; Q2 = 4200 units. We get ed = -2.23.
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