Simplify the expression. 
Definitions:
Mark-up
The amount added to the cost price of goods to cover overhead and profit, determining the selling price.
Regular Selling Price
The standard or usual price at which a product is sold to consumers, without any discounts or promotions.
Markdown
A reduction in the selling price of goods or services, typically to clear excess inventory or stimulate sales.
Selling Price
The amount of money for which a seller offers goods or services to buyers.
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