we have a wholesale price for each products, the shopping system will show different Unit price according the quantity you chose, the rate is in the following: --more than 5(including 5), the unit price is 98% of the sample price; --more than 20(including 20), the unit price is 96% of the sample price; --more than 50(including 50), the unit price is 94% of the sample price; --more than 100(including 100), the unit price is 90% of...