单项选择题

[听力原文]6-7
M: Will you please show me that notebook
W: Certainly.
M: How much is it
W: Twenty-one yuan and fifty fen.
M: Hm. It’s certainly nice, but it’s a bit more than I was thinking of paying. I don’t think I’ll take it.
W: How about that size It’s also very good and much cheaper.
M: Let me see one.
W: This size is ten yuan and ninety fen.
M: That’s very reasonable. I’ll take it then.

How much does the first notebook cost（）

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