1.

PED of X is known to be thrice that of Y. If price of the commodity X increases by 20% and price of the commodity Y decreases by 40%, calculate percentage change in demand in both the cases.

Answer»

SOLUTION :Suppose PED of Y = 1
PED X = 3Y `=3xx1=3`
`{:("Commodity X", "Commodity Y"),(PED=3,PED=1),(PED=("Percentage change in Quantity demanded")/("Percentage change in Price"),PED=("Percentage change in Quantity demanded")/("Percentage change in Price")),(3=("Percentage change in Quantity demanded")/(20%),1=("Percentage change in Quantity demanded")/([-]40%)),("As price of commodity X INCREASE by","As price of commodity Y increase by"),("20%, then quantity demanded must","40%, then quantity demanded must"),("decrease by 60% as per law of demand.","increase by 40% as per law of demand."):}`


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