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题库 / Prep2007E2-DS-210
For each order, a mail-order bookseller charges a fixed processing fee and an additional shipping fee for each book in the order. Rajeev placed five different orders with this bookseller--an order for 1 book in January, an order for 2 books in February, an order for 3 books in March, an order for 4 books in April, and an order for 5 books in May. What was the total of Rajeev's processing and shipping fees for these five orders?
(1) Rajeev's processing and shipping fees were $1.00 more for his order in March than for his order in January.
(2) The total of Rajeev's shipping fees for the five orders was $7.50.
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.
审题，选项2只说了shipping fee，没说processing fee。。
固定费用P，加工费用S
J：P+S P+S+1=P+2S 只能求出S，不能求出P(两个都不符合条件）
F: P+2S
M：P+3S
固定为p，每本书为a
1，只能算出a，但是不知道ppppp
题目看不懂什么鬼
设固定P和每本书额外费用S
一月：P＋S
三月：P＋3S
条件1：P＋S＋1=P＋3S，解得S＝0.5
条件2：S＋2S＋3S＋4S＋5S＝7.5，解得S＝0.5
求Total＝5P＋15S＝？，无法解，所以E
条件2看错了
no information for fixed fee
搞了半天，原来没有读懂题
设固定P和每本书额外费用S
一月：P＋S
三月：P＋3S
条件1：P＋S＋1=P＋3S，解得S＝0.5
条件2：S＋2S＋3S＋4S＋5S＝7.5，解得S＝0.5
求Total＝5P＋15S＝？，无法解，所以E