I had to laugh when I got to this: > She offers a sample math problem from the test: You go to the store and there's a sale. Buy one, get the second half off.

I had to laugh when I got to this: > She offers a sample math problem from the test: You go to the store and there's a sale. Buy one, get the second half off. So if you buy two, how much do you pay? It doesn't even seem answerable. The closest I can think of a way to answer that question is "75%".