安东尼奥读大一时买了5本大学教材，每本花了80美元。而用过的书只卖50美元/本。当书店宣布新课本

涨价10%，旧课本涨价5%的时候，安东尼奥的父亲多给了他40美元。

(1)安东尼奥的预算约束线将如何变动？以纵轴表示新书进行说明。

(2)在价格变动之后，安东尼奥的境况是变好了还是变坏了？

Antonio buys five new college textbooks during his first year at school at a cost of $ 80 each,

Used books cost only $ 50 each. When the bookstore announces that there will be a 10 percent increase in the price of new books and a 5 percent increase in the price of used books, Antonio's father offers him $ 40 extra.

a What happens to Antonio' s budget line？ Illustrate the change with new books on the vertical axis.

b. Is Antonio worse or better off after the price change？ Explain.