A company currently sells 10,000 bottles of "bright pink" nail varnish every year at $5 per bottle If the price is reduced to $4.50 per bottle it is expected that the company will sell an extra 2,000 bottles
What is the price elasticity of demand of the nail varnish?
A . -2.0
B . +2.0
C . -0.5
D . +0.5
Answer: B