Hi, may you show me with a diagram with inelastic , unit elastic and elastic are? And explanation please, the main problem I have is the last part of the question.

Suppose the demand for crossingBridge is given by Q = 22 - P/5 (where Q is measured in thousands of vehicles per day, and P is in pounds per vehicle)

• If the toll (P) is 20, how much revenue (in s) is collected?
• What is the price elasticity of demand at this point?
• Could the bridge authorities increase their revenues by changing their price? What

price should they charge?