Penalty for late filing of st3

ST3 Half yearly Return (Late) is filed before the Notice received from the ST Department

Due date 25/04/2011 - Date of Filing 02/07/2011 - Notice Date 28/07/2011

a) Maximum Penalty amount is 2000 or 20000?

b) ST Officer says that the no. of days delayed should be calculated from Due date to Notice date even though the return is filed before the notice date.

 c) In addition to that ST officer aks to pay Penalty Rs 10,000/- u/s 77. Pls advice