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题库 / Prep2007E2-DS-51
Whenever Martin has a restaurant bill with an amount between $10 and $99, he calculates the dollar amount of the tip as 2 times the tens digit of the amount of his bill. If the amount of Martin's most recent restaurant bill was between $10 and $99, was the tip calculated by Martin on this bill greater than 15 percent of the amount of the bill?
(1) The amount of the bill was between $15 and $50.
(2) The tip calculated by Martin was $8.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
小费是总费用十位数的两倍
（1）总费用是15~50，小费可能是2~10，15%的总费用为15%*15~15%*50=2.25~7.5 所以不能确定小费大于总消费的15%
（2）小费是8，所以总费用是40~49，15%的总费用为15%*40~15%*49=6~6.75， 小费确实大于总消费的15%
选B
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