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Find absolute value of the price elasticity of demand

Two thousand four hundred students subscribed to cable TV services while they enrolled like freshmen. 800 of them students dropped the service while the price of cable rose by $25 to $35 per month. The absolute value of the price elasticity of demand for cable TV between these college freshmen: (w) 2.0. (x) 1.5. (y) 1.2. (z) 1.0. (a) 0.8.

Can anybody suggest me the proper explanation for given problem regarding Economics generally?

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