Not getting a 33 percent discount is the same as paying about 50 percent more.<p>A 33 percent discount on a 100 dollar item makes the price 67 dollars.  Not getting the discount makes the price go from 67 to 100, an increase of 33 dollars, which is a 49.25 percent increase.<p>While we&#x27;re at it, is there a name for when people tell you meaningless things like, &quot;I doubled my sales&quot;, only to discover the sales went from 1 unit to 2.  It&#x27;s an error so common that I imagine it must be named by now.
Does this common math misunderstanding have a name?