On the first 10 items take $3.00 off shipping on each additional item purchased. For example: 10 items purchased equals $27.00 off the total.
On orders over 10 items, item number 11 and beyond will each receive $4.00 off shipping. For example: on a 20 item order the discount for the first 10 items equals $27.00 and the discount for the next ten items equals $40.00. Total discount on a 20 item order: $67.00.