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真是太弱了，两个题目有点CONFUSED ，
Q33:。。。？
A salesperson received a 6-percent commission on the amount of total sales up to and
including $10,000, and an r-percent commission on the amount of total sales over
$10,000. If the salesperson received a total commission of $920 on total sales of $14,000,
what was the value of r?
A. 3.2
B. 4.3
C. 6.6
D. 8.0
E.9.2
我怎么就算得约是6.6呀，因为14000超过10000，所以直接r%*14000=920 r约=6.6，这样条件A salesperson received a 6-percent commission on the amount of total sales up to and
including $10,000,都用不着拉，偶非常弱，不明白的说，ZAZA，是不是理解上出了事？
与以下的比较
Q37: 注意
A certain state has a sales tax of 5 percent on the portion of a purchase price that is greater than $100. If a customer paid a sales tax of $4 on a particular item, what was the purchase price of the item?
A. $120
B. $124
C. $180
D. $184
E.$220 这里不就是5%乘以purchase price=4 purchase price=80，咦小于100的？这时偶就蒙的就是180，因为前面有100。但是根据公式不就是这样算吗？那里出问题？怎么是180？不知道，我不知道！！
这两个题目有很大的相识的地方，估计我肯定哪里没想到什么，哎，糊涂啊不知道哩。。。。。。。。 | 
