Jon decides to take up baseball.  He can throw a fastball at 80 miles per hour.   He goes through intense training 4 times for 4 weeks each time and at the end of the last one he can throw a ball 20% faster.  How much speed (in mph) did he gain per week, assuming he gained an equal amount of speed (in mph) each week?
How fast did Jon throw the ball after the last training? ** He threw the ball 80*.2=<<80*.2=16>>16 mph faster
How many weeks did Jon train? ** He was training for 4*4=<<4*4=16>>16 weeks
How fast did Jon gain speed? ** So he gained 16/16= <<16/16=1>>1 mph per week
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