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请NN们帮忙解答prep数学题

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发表于 2008-11-13 16:47:00 | 只看该作者

请NN们帮忙解答prep数学题

On Jane’s credit card account, the average daily balance for a 30-day billing cycle is the average of the daily balance of $600. Jane made a payment of $300 on the account during the billing cycle. If no other amounts were added to or subtracted from the account during the billing cycle, what was the average daily balance on Jane’s account for the billing cycle?

(1)     Jane’s payment was credited on the 21st day of the billing cycle

(2)     The average daily balance through the 25th day of the billing cycle was $540

 

For each of her sales, a saleswoman receives a commission equal to 20 percent of the first $500 of the total amount of the sale, plus 30% percent of the total amount of the sale is excess of $500. If the total amount of one of her sales was $800, the sales woman’s commission was approximately what percent of the total amount of the sale?

A.      22%

B.       24%

C.       25%

D.      27%

E.       28%

 

For every positive even integer n, the function h(n) is defined to be the product of all the even 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.      Greater than 40

 

At least 100 students at a certain high school study Japanese. If 4 percent of the students at the school who study French also study Japanese, do more students at the school study French than Japanese?

(1)   16 students at the school study both French and Japanese

(2)   10 percent of the student at the school who study Japanese who also study French

 

Last month 15 homes were sold in Town X. The average (arithmetic mean) sale price of the homes was $150,000 and the median sale price was $130,000. Which of the following statements must be true.

1.      At least one of the homes was sold for more than $165,000

2.      At least one of the homes was sold for more than $130,000 and less than $150,000

3.      At least one of the homes was sold for less than $130,000

A.    1 only

B.     2 only

C.     3 only

D.    I and 2

E.     1 and 3


[此贴子已经被作者于2008-11-13 17:39:28编辑过]
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