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Question

Price elasticity of supply of Good Y is three-fourth the price elasticity of supply of Good-X. The price of X rises from Rs. 10 to Rs.11.50 per unit and its quantity supplied increased by 18 percent. If price of Y falls from Rs. 11 to Rs. 9.90, find the percentage fall in its supply.

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Solution

Percentage change in price of X=11.501010×100=1.510×100=15percent
Percentage change in supply of X=18 percent
Percentage change in price of Y=9.901111×100=1.111×100=()10percent
Percentage change in supply of Y=?

Given,
Price elasticity of supply of Good-Y=34(PriceelsticityofsupplyofGoodX)
PercentagechangeinsupplyofYPercentagechangeinpriceofY=34(PercentagechangeinsupplyofXPercentagechangeinpriceofX)
PercentagechangeinsupplyofY()10=34(1815)
Percentage change in supply of Y=3×18×()104×15=()9percent
Percentage fall in supply of Y=9%

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