gre The total amount that Mary paid for a book was equal to

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gre
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.Marry paid for the book with $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.

书钱+税 = 付的钱 = （1+0.04）*书钱 > 10 - 3 = 7,
7< 付的钱 = 1.04*书钱 < 10.
7/1.04 < 书钱 < 10/1.04 = 9.615,
A is not always true.
比如,书钱=9.6刀时,付的钱=9.6*1.04=9.984,找零0.016 7/1.04 = 6.73,B is not always true.
比如,书钱 = 6.75刀时,付的钱=6.75*1.04=7.02,付10刀,找零2.98刀

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