Price inclusive of excise duty

satwick adhikary (account assistance) (26 Points)

18 June 2015  
Hi,
this is my first post & first quarry
 
Many manufacturers in India (like Pidilite Industries) have their Price List (PL) inclusive of Excise Duty (ED). Now 
 
example: If List Price of Item A = 100 ( then in normal circumstances if a customer is given a discount of 10% ) then the price would be 100-10% = 90.
 
Now in  there is a need for this prices to be inclusive of Excise duty so if we assume the Excise Duty is 12% then how to calculte it? (How to do Backword Calculation in this case?)
 
NB: MRP of Drum Of 300 Ltr is Rs. 3000
 
Thanks in Advance