title: Magento Quantity Discount by Percentage
body: <p>Are there percentage based quantity discounts?</p>
  
  <p>I’m using Magento 1.8 and I want quantity discounts expressed as percentages.</p>
  
  <p>I don’t see that in Magento. I know setting new Tier Prices but I want a Tier Price by a giving percentage.</p>
  
  <p>For example, if someone buys 5 or more of Product X, I want to give them a 5% discount, If s/he buys 10 or more I want to give 10% discount....</p>