推 minimumi:我了解了~謝謝喔 12/21 19:48
我的算法:
N(1-b) 1050+210
-------- = ----------- = 6/5 = 0.9/0.75
N(1-a) 1050
所以是14天
※ 引述《minimumi (米尼)》之銘言：
: ADVANCED PURCHASE DISCOUNTS FOR AIRLINE TRAVEL
: Days Prior to Departure Pecentage Discount
: 0-6 days 0%
: 7-13 days 10%
: 14-29 days 25%
: 30 days or more 40%
: 20. The table above shows the discount structure for advanced purchase
: of tickets at a particular airline. A passenger bought a ticket at
: this airline for $1,050. The ticket agent informed her that, had she
: purchaced the ticket one day later, she would have paid $210 more.
: How many days before her departure did she purchase her ticket?
: (A) 6 days
: (B) 7 days
: (C) 13 days
: (D) 14 days
: (E) 29 days
: Ans: (D)
: 英文有看懂~但還是不會做...
: 不知道能不能幫忙解一下呢?謝謝囉~~
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