20 percent off of $50 means you pay $40 and save $10. The discount itself is $50 times 0.20, which is $10, and $50 minus $10 leaves $40 at the register. In store language, $50 is the original price (sometimes called the list price), $10 is the markdown, and $40 is the sale price — the number you actually pay before tax.
Percent Off Is a Share, Not a Dollar Amount
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