Use Change Post to change the price of an item by a specific dollar amount. For instance, an item with the price of $10.00 on the price tag is crossed out and replaced with $7.00.
Change Post may also be used to change an item’s selling price by a percentage (e.g. 20% off during a sale), however, it is more convenient to use Sale Post instead. For more information on Sale Post please see the section entitled Sell an Item at a Percentage Discount.

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Sell an Item at a Percentage Discount