You are a monopolist who sells textbooks to undergraduate students. Currently you sell 100 books at a price of​ $100 each, for revenue of​ $10,000. Each book is essentially costless to​ print, so you ignore fixed costs and focus on maximizing revenue. Based on research by your marketing​ team, you learn that some students will not buy the book if the price goes up.​ Also, if you cut the​ price, more students will buy the book. Suppose the price elasticity of demand is​ -0.5. If the price of each textbook is increased by 10​ percent, the new revenue earned is ​$ nothing.