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Determine price and quantity by elasticity of demand

The price elasticity of demand at a specified price and quantity is demonstrated by the ratio of the relative as: (w) change within quantity demanded over a specified proportional price change. (x) reciprocal of the price elasticity of supply. (y) slope of the demand curve. (z) angles at that demand intersects supply.

Please guys help to solve this problem of Economics with some explanation.

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