When tolls on the Dulles Airport Greenway were increased from $1.05 to $1.25, traffic decreased from 20,000 to 15,000 trips a day. Assuming all changes in quantity were due to the change in price, what is the price elasticity of demand for the Dulles Airport Greenway? Instructions: Enter your response rounded to two decimal places. Remember that price elasticity of demand is expressed as a positive number. Do not include a negative sign (-) in your response. Price elasticity of demand is