Circuit breakers

The Nifty closed yesterday at 24,500. (a) Compute the 10%, 15% and 20% lower trigger levels. (b) If the index falls 10% at 13:40, how long is trading halted, and how does it restart? (c) If after restarting it falls 15% from yesterday's close at 14:10, what happens? (d) A non-F&O stock in the 5% band closed at ₹412. Up to what price can it trade today, and what does a "close at the lower band" in your data mean for a backtest that sells at the close?