The Delaware River Joint Toll Bridge Commission increased the toll from $0.50 to $1.00 on the bridges on Route 22 and Interstate 78 from New Jersey to Pennsylvania. Use the information in the following table to answer the questions. (Assume that besides the toll change, nothing occurred during these months that would affect consumer demand.)

a. Calculate the price elasticity of demand for each bridge, using the midpoint formula.
b. How much total revenue did the commission collect from these bridges in November? How much did it collect in December? Relate your answer to your answer in (a).

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Number of Vehicles Crossing the Bridge Route 22 Bridge 78 Bridge 519,337 433,691 Interstate Toll Month November $0.50 December $1.00 728,022 656,257