I sent this suggestion in to the Procter & Gamble people.  My follow up number is #100605-001913.

Your twin pack of 2 - 100 Oz. bottles purchased at Sam’s Club has incorrect metrics.  On the box it says, “15% MORE*”.  The star at the  bottom says, “*than 170oz.”

Now, while the 15% more sounds like you are getting a great deal, the advertisement is actually trying to illustrate basic math.  The problem is, you even got the basic math wrong.

170 is 15% LESS than 200.  15% more than 170 is actually 195.5.  The actual deceptive percentage you needed to use is approximately 17.647% MORE than 170, but that would look a little strange on the box.  

Perhaps 100% more than 100 Oz. would work better.  Or 33 1/3% more than 150 Oz.  Or even 300% more than 50Oz.  The product should fly off the shelf with that declaration of 7th grade mathematics.