GWD有题不会。。。很急~请教大家

傻熊有傻福

1.DS:The operation* represents either addition, subtraction, or multiplication of integers, what is the value of 1*0?

(1)0*2=2

(2)2*0=2

答案是A，条件（2）有可能是+或—，但是这两种情况下，1*0的结果只有一个啊。。。这样也不可以么？
2. PS:Of the families in City X in 1994, 40 percent owned a personal computer. The number of families in City X owning a computer in 1998 was 30 percent greater than it was in 1994, and the total number of families in City X was 4 percent greater in 1998 than it was in 1994. what percent of the families in City X owned a personal computer in 1998?

1. 50%
   
   
2. 52%
   
   
3. 56%
   
   
4. 70%
   
   
5. 74%
   
   

这题的叙述让我很纠结。。。很凌乱。。。
3.DS: From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?

(1)If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504

(2)During this period of time, the increase in the balance in the checking account was 8 percent.

AMY晓慧

第一个答案貌似错了吧？感觉（1）（2）都能退出来，应该选D
第二个我做过，答案也错了。应该选C。题中说从MAY1到30，余额增长，问30号余额为多少
（1）如果在这段时间余额增长了12%，到30余额为504。这个条件能求出原来一号有多少钱
（2）在这段时间内月涨了8%。 加上第一个条件，能求出30号余额为多少