Cost of buying vs. renting textbooks

This is a graph showing the varying prices of a textbook from four different retailers.  The graph also compares the difference in price with renting vs buying the textbook.  The four retailers are the UConn Co-Op Bookstore, Amazon, Chegg and Half.com.  

The textbook used, Introductory Chemistry Essentials (4th Ed.), is a frequent purchase among undergraduates as it is a required textbook for CHEM 1122, a prerequisite for higher-level science courses.  

If you want to buy the textbook new, the UConn Co-Op Bookstore charges $80.41 more than Amazon, the second-priciest option. It charges $110.43 more than Half.com, the cheapest option.  

As for renting the textbook, the UConn Co-Op is $45.91 more than Amazon, the second-priciest option. It costs $68.03 more than Chegg, the cheapest option.