Offers & Discounts

Hi Folks. Lets have some fun. My friends at VIRAYA are trying to solve this puzzle, but it seems that their efforts are unfruitful. So they are trying to some discount if you help them in solving this. The puzzle they are trying to solve is a SUDOKU. The discount they are going to give is:

Discount: FLATABC, if amount > 2500

Discount: FLATDEF, if amount > 3500

Discount: FLATGH9, if amount > 4500