the table shown above shows the discount structure for advanced purchase of tickets at a particular airline. a passenger bought a ticket at this airline for $1050. 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 days

days prior to departure percentage discount

0-6 days 0%
7-13 days 10 %
14-19 days 25%
30 days or more 40 %