3. A.
The disposable income of Mehta family increases from Rs 5000 to Rs 15,000. As a result,
the family‘s demand for milk and milk goods has increased from 30 liters to 60 liters per
month. Calculate the income elasticity of demand. (5 Marks)
3. B.
A drop in the price of lemons from Rs 100 per kg to Rs 60 Per Kg increases the quantity
demanded from 1.75 to 7 kg per week. Calculate the price elasticity of demand. (5 Marks)
3.a) income elasticity of demand= "\\%" "change in quantity demanded\\over change in icome"
percentage change of quantity demanded"=new value-old value\\over old value"
percentage change of quantity demanded ="60-30\\over30" =1
percentage change in income ="15000-5000\\over5000" =2
Therefore price elasticity of demand ="1\\over 2" =0.5
=0.5
3.b) price elasticity of demand = "percentage change in quantity demanded\\over percentage change in price"
percentage change in quantity demanded ="7-1.75\\over 1.75" =3
percentage change in price="60-100\\over100" =0.4
Thus, price elasticity of demand ="0.4\\over 3"
=0.1
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