India in quarters...

Well, India isn't through to the quarters yet...
A worst scenario can knock out India before the knockout stage.

Scenario:
Bangladesh should beat SouthAfrica and WestIndies should beat India very badly.

Very badly conditions:
If India bat first: India scores 150, Windies should chase it in 21.3 overs.
India scores 200, Windies should chase it in 21.4 overs.
India scores 250, Windies Should chase it in 22.1 overs.
India scores 300, Windies Should chase it in 22.3 overs.
India scores 350, Windies Should chase it in 23.0 overs.
If Windies bat first: Windies scrore 350, India should be bowled out within 186runs.
Windies scrore 300, India should be bowled out within 139runs.
Windies scrore 250, India should be bowled out within 92runs.
Windies scrore 200, India should be bowled out within 45runs.

These are my calculations.. there might be an error of (+/-)3balls or (+/-)10runs..