1.Discount: order off 3% from 4th,September to 11th

                        order off 2% from 12th,September to 19th

                        order off 1% from 20th, September to 28th

Promotion: 1.if the order if full of $988, it will be reduce $10

                    2.if the order if full of $1999, it will be reduce $20

                    3. if the order if full of $2999, it will be reduce $30