Making GST work better for MSMEs and Traders: Should old or pre-GST stock be allowed to sell at the lower of the two MRPs (pre GST and post GST) after Oct 1, 2017

If pre GST MRP = 100, post GST MRP = 80 then Sale MRP = 80
If pre GST MRP = 100, post GST MRP = 120 then sale MRP = 100