Worked perfectly for me

Worked perfectly for me to add a discount based on multiple minimum quantities. My text for the discount box is:

<strong>Bulk Order Discounts Available</strong><br>
Order min. 10 pieces of this item, Receive 5% discount <br>
Order min. 30 pieces of this item, Receive 10% discount <br>
Order min. 100 pieces of this item, Receive 15% discount <br>
(Discount will be calculated and appear in shopping cart)

Then just added three different discount lines, and viola!