In: Economics
Elasticity of demand is the change in quantity demanded due to change in own price of the commodity. It can be calculated as:
Elasticity of demand = % change in quantity demanded / % change in price
We have, Ed = 0.9, % change in qty. demanded = 2%
0.9 = 2% / % change in price
% change in price = 2/0.9
Percent change in price = 2.22%
It shows that if there is increase in price by 2.22%, it will lead to fall in quantity by 2%.