This pullover begins with the lower back, which is worked form side to side. The upper back is picked up and worked to the shoulders. The front and sleeves are worked for the bottom up.

The yarn mill packaged this yarn in several different sized hanks (both 100 gr and 50 gr) and the yardage got confused.
It should take twice as much yardage.
50 grams has 112 yards
100 gram has 224 yards

Official change in book:
Flared Pullover, page 261:
Under YARN, change yarn yardage info from 112 yards (102 meters) to 224 yards (205 meters).