求助一道陈向东数学题

mnmicy · 发表于 2020-11-2 20:44:25

ADVANCED PURCHASE DISCOUNTS FOR AIRLINE TRAVEL
days prior to departure                percentage discount
  0~6days                                              0%
  7~13days                                           10%
14~29days                                           25%
30 days or more                                  40%

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 purchased 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 dyas

各位大神，ACE很好排除。那么请问怎么算出来的D？

mnmicy · 发表于 2020-11-2 20:52:58

已经明白了

求助一道陈向东数学题

所属分类: GMAT考试

正在浏览此版块的会员 ()