Rs.15.4 lakh crore. That was the estimated amount of old notes( 500 and 1000 Rs) in circulation, according to RBI data. As of Dec-28, 90% of the amount has been deposited in banks.
Note:
1. Data taken from Weekly Statistical Supplement of RBI and Press releases of Finance Ministry(upto 13-Dec)
2. Data for 28-Dec was taken from news reports