Here is an easy riddle. Recommended for those who haven't studied too much of maths.
There are 100 people in a room.
$99\%$ of the people in the room are literate.
Some people are removed.
Now, $98\%$ of the people in the room are literate.
How many people were removed?
And don't tell me that someone was educated sitting in the room... :)
If your first answer was $1$, you're wrong.