新东方OG中的新GRE数学题解析（17）
2015-12-31 17:14 新东方网
21.The total amount that Mary paid for a book was equal to the price of the book plus a sales tax that was 4 percent of the price of the book. Mary paid for the book with a $10 bill and received the correct change, which was less than $3.00. Which of the following statements must be true?
Indicate all such statements.
A The price of the book was less than $9.50.
B The price of the book was greater than $6.90.
C The sales tax was less than $0.45.
如果设书的价格是x，那么总的支出是1.04x，根据题意有(10-3)<1.04x<10,解得6.73
编辑：张雨
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