1.

When the price of a commodity falls by 20 per cent, its demand rises from 400 units to 500 units. Calculate its price elasticity of demand

Answer»

Solution :`Ed = (% "CHANGE in Quantity Damanded")/(%"Change in PRICE")`
% change in Quantity Demanded `= (Q_(2) - Q)/(Q_(1)) 100`
`= (500 - 400)/(400) xx 100`
`= 25%`
`Ed = (25)/(-20) = 1.25`


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