All in

So I see one orange juice product labeled "100 percent orange juice" and the next, identical in every way, including packaging and supplier, also 100 percent orange juice--PLUS added calcium and vitamin D.

Isn't the second one mathematically impossible? Shouldn't it be something like, oh, I don't know, "More than 99 percent orange juice, plus some stuff we think you'll think is good for you, or at least that will help loosen up your wallet, you tightwad, but neither we nor any competent health care professional have expressed any such opinion, just to be clear about it"?