We have 99 Presidents and 1 director. That 1 director to compose 2% of the total number of people, there must be 50 people in the room, hence 50 Presidents must leave.
There are 100 employees in a room. 99% are President. How many managers must leave the room to bring down the percentage of President to 98%?

1:  1
2:  2
3:  46
4:  50
5:  97