In 2013, when Rupee weakened to 68, Bank Nifty tanked to 8300 and bounced back to a recent peak at 12,200 after Rupee stabilized.

From 8,300 to 12,200 that was a rally of nearly 4,000 points. Lets take the 4000 points as a 100% Range.

Now, a Fibonacci Retracement of 38% of this rally is at 10,700.
Fibonacci Retracement of 61% of this rally is at 9,800 as seen in the below chart.

Whether Bank Nifty will see buyers come in at 10,700 (Or) will we fall to 9800. Much depends on the RBI policy meet coming up.