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题库 / OG2017Q-DS-278
The table above shows the cancellation fee schedule that a travel agency Uses to determine the fee charged to a tourist who cancelsa trip prior to departure. If a tourist canceled a trip with a package price of $1,700 and a departure date of September 4, on what day was the trip canceled?
(1)The cancellation fee was $595.
(2)If the trip had been canceled one day later, the cancellation fee would have been $255 more.
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.
题目分析：
（1） 取消费用为595美元，占出行费用的比例为595/1700=35%，根据表格，是在出发前45-31天取消了形成，但不能确定是哪一天，所以，仅条件1无法解题
（2） 如果再往后一天取消行程，则取消费用会变高，说明取消的时间计算取消费用的边界。但仅根据条件2无法进行判断是哪个边界。
结合条件1和条件2，条件1得出取消的日期在出发前45-31天，条件2，说明如果取消日期再接近出发日期一天，则费用会变高。说明取消日期为出发前31天，问题得解。
因此，本题答案为（C），两个条件结合起来才能解题，任何单独一个均不行。
on what day!
不要脑补，仔细思考。