Small Investment-Big Business with Magento Percentage Tier Price Extension
Magento Percentage Tier Price extension by BSSCommerce extends default Magento Tier Price function by allowing admins to define tier prices as a percentage
See more useful features:
+Easily set up tier price based on standard price or group price
+Set tier price in a fixed amount or in percentage
+Automatically update tier price when price is changed
http://magentoexpertforum.com/attach...tid=5552&stc=1
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