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ZX-99BA92C8142026年5月国际A卷 · 第 20 题
2026年5月国际A卷 · 原库模块 1 · Q20 原库参考解析
A book publishing company pays the author of a certain book $3.75 per book for the first 400 books sold. After the first 400 books are sold, the payment increases to $4.50 per book sold. Which function gives the author's total payment \( P(b) \) , in dollars, in terms of the number of books sold, b, where \( b>400 \)?
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