conversations.from: human
conversations.value: 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?
conversations.from: assistant
conversations.value: He threw the ball 80*.2=16 mph faster
  He was training for 4*4=16 weeks
  So he gained 16/16= 1 mph per week