From May to July, approximately what percent of the increase in the total number of readers of Magazine X was the increase in the number of readers in the 31^40 age group?
A.3%
B.15%
C.18%
D.36%
E.87%
我的答案:
From May to July, approximately what percent of the increase in the total number of readers of Magazine X was the increase in the number of readers in the 31^40 age group?