This is an example. If a student with the new deadline would have a late fee for 1200 Baht without the 2,000 bath installment fee, we should reduce the fee charged from 2,000 Baht to 1,200 Baht only.
In summary, for student with installment fee of 2,000 Baht, if they do not take that option and have late payment fee with the amount of less than 2,000 Baht, we should reduce the fee to the lesser of the two.