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?
He threw the ball 80*.2=<T>multiply(80, 0.2)=16.0 mph faster
He was training for 4*4=<T>multiply(4, 4)=16 weeks
So he gained 16/16= <T>divide(16, 16)=1.0 mph per week
