GWD6&7 两道逻辑题~~ 谢谢了

GWD-8-Q40:

From 1973 to 1976, total United States consumption of cigarettes increased 3.4 percent, and total sales of chewing tobacco rose 18.0 percent. During the same period, total United States population increased 5.0 percent.

If the statements above are true, which of the following conclusions can be properly drawn?

A.      United States manufacturers of tobacco products had higher profits in 1976 than in 1973.

B.       Per capita consumption of cigarettes in the United States was lower in 1976 than in 1973.

C.      The proportion of nonsmokers in the United States population dropped slightly between 1973 and 1976.

D.      United States manufacturers of tobacco products realize a lower profit on cigarettes than on chewing tobacco.

E.       A large percentage of United States smokers switched from cigarettes to chewing tobacco between 1973 and 1976.

选B

In January of last year the Moviemania chain of movie theaters started propping its popcorn in canola oil, instead of the less healthful coconut oil that it had been using until then. Now Moviemania is planning to switch back, saying that the change has hurt popcorn sales. That claim is false, however, since according to Moviemania’s own sales figures, Moviemania sold 5 percent more popcorn last year than in the previous year.

Which of the following, if true, most strongly supports the argument against Moviemania’s claim?

A.      Total sales of all refreshments at Moviemania’s movie theaters increased by less than 5 percent last year.

B.       Moviemania makes more money on food and beverages sold at its theaters than it does on sales of movie tickets.

C.      Moviemania’s customers prefer the taste of popcorn popped in coconut oil to that of popcorn popped in canola oil.

D.      Total attendance at Moviemania’s movie theaters was more than 20 percent higher last year than the year before.

E.       The year before last, Moviemania experienced a 10 percent increase in popcorn sales over the previous year.

选A

我想请问这类有关百分比的题目要怎么做更容易入手？

谢谢啦~~~

其实平时都加的。。。只是今天。。。

谢谢提醒！！下次注意~~~~~