[求助]对GWD4中三道数学，跪乞赐教

Q24: （难道有陷阱这道题，
            不就是分别将5 和 1带到式子里，所得的结果
            相减吗？
            我的答案是B）

        

At a certain company, each employee has a salary grade s that is at least 1 and at most 5.  Each employee receives an hourly wage p, in dollars, determined by the formula
p = 9.50 + 0.25(s – 1).  An employee with a
salary grade of 5 receives how many more dollars per hour than an employee with
a salary grade of 1?

        

A.    $0.50

        

B.     $1.00

        

C.    
$1.25

        

D.    $1.50

        

E.     $1.75

        

 

        

Q29:
            （答案是B，我选A了，因为
            设97年rent =a ，
            那么99 年的rent 应为
            （1+ x%-y%）a ，
            只要99的值/97年的值大于1，就可知99年的比97年的多。

        

        就是说，要知道
            x% -y% >0, A 正好解答了。
            ）

        

The annual rent collected by a corporation from a certain
building was x percent more in 1998
than in 1997 and y percent less in
1999 than in 1998.  Was the annual rent collected by the corporation from
the building more in 1999 than in 1997?

        

(1)
                 
x > y

        

(2)
                 
xy/100 < x – y

        

Q36: （这道题给C，觉得，有问题，因为 B 单独就可以。
            n/45=2，4，6….且100
<n< 200,所以取n/45=4，
            n=180）

        

If n is an integer
and 100 < n <200, what is the
value of n?

        

(1)
              n/36 is an odd integer.

        

(2)
              n/45 is an even integer