At a Price of $4,a Gas Station

Multiple Choice

At a price of $4,a gas station.sold 100 gallons of gasoline per week.When the price rose to $4.5,only 80 gallons were sold per week.Using the initial-value method,the price elasticity of demand for gasoline at Greedy Inc.Gas Station is:

A) 0.2.
B) 0.16.
C) 2.
D) 1.6.