John attends a protest for 4 days.  He then attends a second protest for 25% longer than the first.  How many days did he spend protesting?
How many days was the second protest? ** The second protest was 4*.25=<<4*.25=1>>1 day longer than the first.
How many days was the second protest? ** So the second protest was 4+1=<<4+1=5>>5 days.
How many days did he spend protesting? ** Thus he spent 4+5=<<4+5=9>>9 days protesting.
#### 9