Toilet Paper Roll Comparison

Ok, so we have all opened that big puffy bag of potato chips and were disappointed by the small number of chips in the bag, but this recent scandal hits below the belt.  I noticed after purchasing an economy package of toilet paper there was something strange when comparing the old roll to the new roll.  Notice the credit card in the middle with the old roll on the left and the new roll on the right.  My questions was, in a pack of 24 rolls how much toilet paper did they short us by using a larger tube?  I also place two other photos here so we can somewhat ignore the geometry of the camera angles and get perpendicular views of each tube opening.  What I would do with a class of students is give them a credit card, ruler, and these three photos so that they can go to work, and become mathematically literate shoppers.

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