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Step-by-step explanation:
Markup is the name given to the difference between a cost price and a selling price:
cost price + markup = selling price
Markdown is a name given to the difference between a list price or tag price and the actual selling price.
list price - markdown = selling price
Markup and markdown are actual currency amounts. Often, sellers relate them to the cost price or the list price using percentages. That is, the percentage markup can be figured as ...
percent markup = (markup)/(cost price) × 100%
Similarly, the markdown may be expressed as a percentage of the selling price:
percent markdown = (markdown)/(selling price) × 100%
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Additional comments
These representations as percentages are often used because a seller is usually interested in having a specific percentage return on money invested. By making the markup a specific percentage of the cost price, that return can be ensured.
Markdown percentages are often important to a buyer. They look for sales that offer a large percentage discount (markdown), sometimes not paying so much attention to the list price.