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Find price elasticity of demand by arc elasticity formula

When the price of plastic moose heads increases from $25 to $35 and monthly sales drop by 2000 units to 1000 units, by using the arc elasticity formula, in that case their price elasticity of demand equals: (w) 1/3. (x) 3.0. (y) 2.0. (z) 2.5.

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