Assume it costs twice as much to print the single copy of handbook on demand as it costs to print every copy when they are printed in volume. What fraction of students should utilize alternative access methods for university to save 21% of its printing cost for handbooks overall? What if cost ratio of single copy printing to cost of every copy when printed in volume 5:1? If 85% of students access handbooks online, how much expensive can single copy printing be for university to break even on printing handbooks?