一道GWD30的数学。。不懂不懂。。

mxzhcx · 发表于 2011-10-15 00:13:37

Q27:
Foreach landscaping job that takes more than 4 hours, a certain contractor chargesa total of r dollars for the first 4 hours plus 0.2r dollars foreach additional hour or fraction of an hour, where r > 100. Did a particular landscaping job take morethan 10 hours?
(1) Thecontractor charged a total of $288 for the job.
(2) Thecontractor charged a total of 2.4r dollars for the job.

A.Statement (1) ALONE is sufficient, but statement (2) alone is notsufficient.
B.Statement (2) ALONE is sufficient, but statement (1) alone is notsufficient.
C.BOTH statements TOGETHER are sufficient, but NEITHERstatement ALONE is sufficient.
D.EACH statement ALONE is sufficient.
E.Statements (1) and (2) TOGETHER are NOT sufficient.

答案给的是B。。但是我怎么看都是D。。。
求解。

lalune0802 · 发表于 2011-10-15 00:25:19

r >288的话不到一个小时就收288了呗

mxzhcx · 发表于 2011-10-15 09:21:59

可是人家前提是大于四个小时才能用R+0.2R*（X-4）做啊所以不能用288的

一道GWD30的数学。。不懂不懂。。

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