Hi! We were reading a text in school and there was this sentence: Over 2 billion pounds has now been spent on the docks alone... (in the text "pounds" is not written with a word, but with a sign), and we were talking about whether this was the right way to say it or it would be better to say: 2 billion pounds have now been spent, (since a billion of something definitely is plural). Well we couldn't decide and not even the teacher knew for sure. So I would be really glad if somebody could tell me what is the right way to say this, and why. Thank you!