The supply curve of commodity E passes through the origin and makes an angle of 60 degrees .when its price rises by 60%, its quantity supplied rises by 20 units .calculate its original supply.

Dear student, 

It is given that the supply curve passes through origin. 
Irrespective of the angle of origin if the supply curve passes through origin the elasticity of supply is equal to one. 


Es = Percentage change in quantity supplied Percentage change in price1=change in QuantityOriginal Quantity×100601=20Original Quantity×10060So, original Quantity = 33.3 units

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it infers that es=1 then u can easily calculate the original supply
 
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How did you know that es=1 ??
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