再请教几道prep里的计算题

阿抠

1.Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one’s annual income to the average (a.m.) of 100 units of Country R’s currency and 1 percent of one’s annual income. Which of the following represents the simplified formula for computing the income tax, in Country R’s currency, for a person in that country whose annual income is I?


2.If x is positive, which of the following could be the correct ordering of 1/x, 2x, and x².
I.X² <2x<1/x
II.X²<1/x<2x
III.2x<x²<1/x

3.For every positive even integer n, the function h(n) is defined to be the product of all the even in integers from 2 to n, inclusive. If p is the smallest prime factor of h(100)+1, then p is
A.Between 2 and 10
B.Between 10 and 20
C.Between 20 and 30
D.Between 30 and 40
E.Greater than 40


4.上个月Town X卖出了15套房子，平均售价为150000美元，median sale price 为130000美元，以下哪个是对的？
1.至少有一套房子售价高于165000
2.至少有一套房子售价高于130000且低于150000
3.至少有一套房子售价低于130000



正确答案：1.    50+I/40
      2.     I and II only
      3.     E
      4.    only 1
求解

阿抠

自己顶上去，大N呢