Sensex tanks 1,266.17 points to 79,235.91 after FM hikes STT on F&O; Nifty tumbles 435.05 points to 24,074.20.

Sensex tanks 1,266.17 points to 79,235.91 after FM hikes STT on F&O; Nifty tumbles 435.05 points to 24,074.20.