Price elasticity of demand when price falls

When P = \$10 for Tiny Tee-shirts, and Q = 20, but when P = \$5, Q = 25. The price elasticity of demand for Tiny Tee-shirts of: (w) 3.0. (x) 1/3. (y) 1/2. (z) 21.

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

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