Answer :

Ed = Percentage change in quantity demanded/Percentage change in price

2 = Percentage change in quantity demanded/20%


Percentage change in quantity demanded = 2*20 = 40%


New quantity = Original quantity + Change in quantity


New quantity = 40 +40% of 40


New quantity = 40 + 40/100*40


New quantity = 40 + 16


New quantity = 56


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