the price elasticity of supply of commodity X is 1/2 of price elasticity of supply of commodity Y . when price of X falls by 50 % , its supply falls by 20 units . calculate price elasticity of supply of commodity X and Y by using percentage method if 100 units of X were supplied at price of rupees 4 per unit .  ( experts please give the answers with same numbers which is provided in question don’t change the numbers and don’t provide any link .)

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