LiveScience has this in an article about customer satisfaction:

And when math is involved, most of us can't cope. For example: See if you can calculate the total savings in the setup: 20 percent off the original price plus an additional 25 percent off the sale price. How much is that item marked down? If you said 45 percent off, then you're math skills are as pitiful as the 85 percent of college students who also got this wrong in a study last year by researchers at the University of Miami and the University of Minnesota.

Is it just me or did that "you're" jump out at you, too? But, it's okay. I don't DO English.
Update: Got fixed! They apparently read the comments on their articles.