This is exactly what bothers me and resulted in me wanting to look up the question online. On the quiz the other 2 questions were definitive. This one technically could have more than one answer so this is where phycologists actually mess up when trying to give us a trick question. The ball at .4 and the bat at 1.06 doesn’t break the rule either.
Interesting: these could cover a couple of misunderstandings, one is that B>=100, the other that “The bat costs $1.00 more than the ball” does not mean B-b=100, but that B-b>=100.
In ordinary language, “that costs $1.00 more than the other one” is not incorrect if the difference is $1.01.
I suspect that person would have been corrected by saying “the bat costs precisely one dollar more than the ball”
Interesting: these could cover a couple of misunderstandings, one is that B>=100, the other that “The bat costs $1.00 more than the ball” does not mean B-b=100, but that B-b>=100.
In ordinary language, “that costs $1.00 more than the other one” is not incorrect if the difference is $1.01.
I suspect that person would have been corrected by saying “the bat costs precisely one dollar more than the ball”