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=
<gadget id="calculator">80*.2</gadget>
<output>16</output>
16 mph faster.
He was training for 4*4=
<gadget id="calculator">4*4</gadget>
<output>16</output>
16 weeks.
So he gained 16/16= 
<gadget id="calculator">16/16</gadget>
<output>1</output>
1 mph per week.

<result>1</result>