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Problem on Elasticity formula

Whenever the price of plastic moose heads increase from $5 to $7, monthly sales fall from 2000 to 1000 units. By using the arc elasticity formula, the price elasticity of demand will be: (i) 3.0. (ii) 1/3. (iii) 2.0. (iv) 2.5.

Can someone help me in getting through this problem.

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