It is difficult to consult this case.
Because IIT said that it is policy for repairing quotation THB4.0 and negotiate cost 30%. As I said before, I thougt that it is very big profit but IIT said it is nomal case at the last meeting.
and If you revise quotaion THB3.1 to customer May be customer will ask reason of price change to IIT.
how are you going to explain ?
sorry I have no idea now.