A study of about 1,800 U.S. colleges and universities resulted in the demand equation q = 9,900 − 2p, where q is the enrollment at a college or university, and p is the average annual tuition (plus fees) it charges. (a) The study also found that the average tuition charged by universities and colleges was $2,700. What is the corresponding price elasticity of demand? (Round your answers to two decimal places.)