<human>:  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?
<bot>: 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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