A job that was not finish by a Professional Scammer (kabirchy, his name Khorshed Alam)needs to be fix. It is about category quantity price, items in a specific category needs to be quantity priced:
1 item = $20.00
2 items = $16.00
3 items = $13.00
4 items = $10.00
5 or more items from this specific category, the price will be it's regular price.
Eliminate a step in the customer registration and in order process.