Bugs in Schweser Practice Exam Questions

hey folks,

anybody noticed schweser practice exam q&a has a lot of bugs? could somebody please check frm level 1 book 4 practice exam question n° 12. I feel the calculation of the upside probability is wrong; how did they calculate for U=1,2 and for D=0,8? if delta t is 0,25 and vola is 0,2 the U should be around 1,1. Am I wrong?

cheers,

andoff